How many season numbers are there for the episodes written by Art Everett?
CREATE TABLE table_2226817_6 (
    no_in_season VARCHAR,
    written_by VARCHAR
)
SELECT COUNT(no_in_season) FROM table_2226817_6 WHERE written_by = "Art Everett"
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: How many season numbers are there for the episodes written by Art Everett? ### Input: CREATE TABLE table_2226817_6 (
    no_in_season VARCHAR,
    written_by VARCHAR
) ### Response: SELECT COUNT(no_in_season) FROM table_2226817_6 WHERE written_by = "Art Everett"