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
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: Who were the writers for series number 20? ### Input: CREATE TABLE table_11951237_1 (
    written_by VARCHAR,
    series__number VARCHAR
) ### Response: SELECT written_by FROM table_11951237_1 WHERE series__number = 20