why "alter table" to change owner of sequence?

if i create sequence m and then want to change it's owner to some other
account i have to issue:
alter table <sequence_name> owner to ...;

why can't it be: alter sequence?

example:

# create sequence x;
CREATE SEQUENCE

# \d
List of relations
Schema | Name | Type | Owner
--------+------+----------+--------
public | x | sequence | depesz
(1 row)

# alter sequence x owner to pgdba;
ERROR: syntax error at or near "owner"
LINE 1: alter sequence x owner to pgdba;
^
# alter table x owner to pgdba;
ALTER TABLE

# \d
List of relations
Schema | Name | Type | Owner
--------+------+----------+-------
public | x | sequence | pgdba
(1 row)

depesz

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