Who were the writers for series number 20?
CREATE TABLE table_11951237_1 (written_by VARCHAR, series__number VARCHAR)
SELECT written_by FROM table_11951237_1 WHERE series__number = 20
### Context: CREATE TABLE table_11951237_1 (written_by VARCHAR, series__number VARCHAR) ### Question: Who were the writers for series number 20? ### Answer: SELECT written_by FROM table_11951237_1 WHERE series__number = 20