Permission; select currval('seq')

I need to have members of a particular user
group insert rows into a table and then determine the
recently inserted statement's primary key that was
created from a sequence with the currval() function:

   select currval('bla_bla_id_seq');

I have been unable to set these permissions.
I am using 8.1.15 and as the db superuser "postgres".
I execute the following:


  test=# CREATE GROUP test_group_01;
  CREATE ROLE

  test=# ALTER GROUP test_group_01 ADD USER ivan;
  ALTER ROLE

  test=# CREATE TABLE bla (bla_id serial);
  NOTICE:  CREATE TABLE will create implicit sequence "bla_bla_id_seq"
  for serial column "bla.bla_id"
  CREATE TABLE

  test=# GRANT USAGE ON SEQUENCE bla_bla_id_seq TO GROUP test_group_01;
  ERROR:  syntax error at or near "bla_bla_id_seq" at character 25
  LINE 1: GRANT USAGE ON SEQUENCE bla_bla_id_seq TO GROUP
  test_group_0...
                                  ^
  test=# GRANT SELECT ON bla TO GROUP test_group_01;
  GRANT
  test=# GRANT INSERT ON bla TO GROUP test_group_01;
  GRANT

  test=# GRANT USAGE ON SEQUENCE bla_bla_id_seq TO GROUP test_group_01;
  ERROR:  syntax error at or near "bla_bla_id_seq" at character 25
  LINE 1: GRANT USAGE ON SEQUENCE bla_bla_id_seq TO GROUP
  test_group_0...

Why is the "GRANT USAGE ON SEQUENCE" statement failing?
User "ivan" can insert and update table "bla" but cannot execute
"select currval('bla_bla_id_seq');" What does the db superuser
need to execute?

Thank you for your help!