What is the series number for Season #18?
CREATE TABLE table_532 (
    "Series #" real,
    "Season #" real,
    "Title" text,
    "Directed by" text,
    "Written by" text,
    "Original air date" text
)
SELECT MIN("Series #") FROM table_532 WHERE "Season #" = '18'
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: What is the series number for Season #18? ### Input: CREATE TABLE table_532 (
    "Series #" real,
    "Season #" real,
    "Title" text,
    "Directed by" text,
    "Written by" text,
    "Original air date" text
) ### Response: SELECT MIN("Series #") FROM table_532 WHERE "Season #" = '18'