Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_name_15 ( format VARCHAR, label VARCHAR, catalog VARCHAR, date VARCHAR )

### Question ###
What is the format for the album under the label, luaka bop, that had a catalog number of 3645 and dated after 1981?

### Accurate SQL ###

SELECT format FROM table_name_15 WHERE catalog = "3645" AND date > 1981 AND label = "luaka bop"