CREATE TABLE table_52503 ("Series #" FLOAT, "Season #" FLOAT, "Title" CLOB, "Directed by" CLOB, "Original air date" CLOB, "Production code" CLOB)

What is the season for series 81?
SELECT "Season #" FROM table_52503 WHERE "Series #" = '81'
SELECT "Season #" FROM "table_52503" WHERE "Series #" = '81'