Display default access privileges for relations, sequences and functions in Postgres

Using the psql(1) interactive terminal

There is another way, at least in recent Postgres versions.
Use the \ddp command

               Default access privileges
     Owner      | Schema |   Type   | Access privileges 
----------------+--------+----------+-------------------
 role_x         |        | function | =X/role_x
 role_x         |        | sequence | 
 role_x         |        | table    | 
 role_x         |        | type     | =U/role_x

Read more about it under the Notes section here:
http://www.postgresql.org/docs/current/static/sql-alterdefaultprivileges.html