CREATE TABLE table_21622 ("Series #" FLOAT, "Season #" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT)

If Arthur Albert is the director, what is the maximum series number?
SELECT MAX("Series #") FROM table_21622 WHERE "Directed by" = 'Arthur Albert'
SELECT MAX("Series #") FROM "table_21622" WHERE "Directed by" = 'Arthur Albert'