How to create a dynamic list?

I 'd like create a type like a dynamic list.

I've tried

CREATE TYPE liste
(
INPUT = array_in,
OUTPUT = array_out,
INTERNALLENGTH = VARIABLE,
ELEMENT = int
);

CREATE TABLE xxx
(
num int,
nom varchar(10),
nb liste,
PRIMARY KEY(num)
);

This instruction give an error :

INSERT INTO xxx
VALUES(1,'aaa',(10,20,30));

ERROR: parser: parse error at or near ")"

Could someone tell me how do I have to do?
Thanks

Renaud THONNART