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_21745 ( "No. in series" text, "No. in season" text, "Title" text, "Directed by" text, "Written by" text, "Original air date" text, "Production code" text, "U.S. viewers (millions)" text )

### Question ###
How many viewers did the episode written by Warren Lieberstein & Halsted Sullivan have?

### Accurate SQL ###

SELECT "U.S. viewers (millions)" FROM table_21745 WHERE "Written by" = 'Warren Lieberstein & Halsted Sullivan'