Name who wrote the episode when the viewers was 1.81
CREATE TABLE table_15584067_7 (
    written_by VARCHAR,
    us_viewers__million_ VARCHAR
)
SELECT written_by FROM table_15584067_7 WHERE us_viewers__million_ = "1.81"
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: Name who wrote the episode when the viewers was 1.81 ### Input: CREATE TABLE table_15584067_7 (
    written_by VARCHAR,
    us_viewers__million_ VARCHAR
) ### Response: SELECT written_by FROM table_15584067_7 WHERE us_viewers__million_ = "1.81"