Sequences not moved to new tablespace

Hello,

I moved all my tables and indexes from one tablespace to pg_default using

ALTER TABLE ... SET TABLESPACE pg_default;
ALTER INDEX ... SET TABLESPACE pg_default;

Some 2500 files were moved to pg_default but 461 files remain in the
tablespace and so I cannot drop it.

When I query, for example:

SELECT oid, relname, relkind FROM pg_catalog.pg_class
WHERE oid IN (943602, 2650968, 2650971);

I see that most of these files are sequences. Why didn't they get moved and
how can I move them to pg_default (and all other remaining files) so that I
can drop the tablespace?

Thanks!