<sequence_name>.sequence_name != <sequence_name>?

When a sequence is created in 7.3.2, it appears you get a new table for each
sequence object. Is it ever possible for the sequence_name in a sequence
relation not to match the name of the relation itself?

For example, suppose I create a table:

CREATE TABLE t1(id serial);

A new relation called 't1_id_seq' is created where

t1_id_seq.sequence_name = 't1_id_seq'

Is that always true?

Ed