SQL to extract column metadata

Hi Everyone -

I'm looking for a SQL statement that I can use to find out if a given
column in a table uses a specific sequence as it's next default value.
Is this possible?

For example, if the table was created with:

CREATE TABLE accounts
(
  account_id integer NOT NULL DEFAULT
nextval(('accounts_account_id_seq'::text)::regclass),
  account_number character varying(40) NOT NULL
)

Is there a way for me to query the database metadata to verify that
accounts.account_id uses the sequence accounts_account_id_seq as it's
default next value?

Thanks in advance!

Scott.