Timing is on.
DROP TABLE
Time: 5,268 ms
SELECT 32
Time: 5,515 ms
CREATE INDEX
Time: 14,971 ms
                                                            QUERY PLAN                                                             
-----------------------------------------------------------------------------------------------------------------------------------
 Nested Loop Left Join  (cost=0.00..8.55 rows=1 width=48) (actual time=818.219..4159.317 rows=1 loops=1)
   Join Filter: (t1.b = t2.a)
   Rows Removed by Join Filter: 31
   ->  Seq Scan on t t1  (cost=0.00..1.48 rows=1 width=8) (actual time=0.026..0.032 rows=1 loops=1)
         Filter: ((c = 0) AND (a = 5))
         Rows Removed by Filter: 31
   ->  Nested Loop Left Join  (cost=0.00..7.06 rows=1 width=40) (actual time=10.588..4159.270 rows=32 loops=1)
         Join Filter: (t2.b = t3.a)
         Rows Removed by Join Filter: 993
         ->  Seq Scan on t t2  (cost=0.00..1.40 rows=1 width=8) (actual time=0.008..0.020 rows=32 loops=1)
               Filter: (c = 0)
         ->  Nested Loop Left Join  (cost=0.00..5.65 rows=1 width=32) (actual time=0.142..129.970 rows=32 loops=32)
               Join Filter: (t3.b = t4.a)
               Rows Removed by Join Filter: 993
               ->  Seq Scan on t t3  (cost=0.00..1.40 rows=1 width=8) (actual time=0.002..0.010 rows=32 loops=32)
                     Filter: (c = 0)
               ->  Nested Loop Left Join  (cost=0.00..4.23 rows=1 width=24) (actual time=0.007..4.055 rows=32 loops=1024)
                     Join Filter: (t4.b = t5.a)
                     Rows Removed by Join Filter: 993
                     ->  Seq Scan on t t4  (cost=0.00..1.40 rows=1 width=8) (actual time=0.002..0.010 rows=32 loops=1024)
                           Filter: (c = 0)
                     ->  Nested Loop Left Join  (cost=0.00..2.82 rows=1 width=16) (actual time=0.003..0.121 rows=32 loops=32768)
                           Join Filter: (t5.b = t6.a)
                           Rows Removed by Join Filter: 528
                           ->  Seq Scan on t t5  (cost=0.00..1.40 rows=1 width=8) (actual time=0.002..0.009 rows=32 loops=32768)
                                 Filter: (c = 0)
                           ->  Materialize  (cost=0.00..1.40 rows=1 width=8) (actual time=0.000..0.001 rows=17 loops=1048576)
                                 ->  Seq Scan on t t6  (cost=0.00..1.40 rows=1 width=8) (actual time=0.008..0.031 rows=32 loops=1)
                                       Filter: (c = 0)
 Planning time: 3.316 ms
 Execution time: 4159.596 ms
(31 rows)

Time: 4165,372 ms (00:04,165)