CREATE TABLE table_532 ("Series #" FLOAT, "Season #" FLOAT, "Title" CLOB, "Directed by" CLOB, "Written by" CLOB, "Original air date" CLOB)

What is the series number for Season #18?
SELECT MIN("Series #") FROM table_532 WHERE "Season #" = '18'
SELECT MIN("Series #") FROM "table_532" WHERE "Season #" = '18'