CREATE TABLE table_30298 ("No. in series" FLOAT, "No. in season" FLOAT, "Title" CLOB, "Directed by" CLOB, "Written by" CLOB, "Original air date" CLOB, "Production code" CLOB, "U.S. viewers  ( million ) " CLOB)

What episode title had a production code of 3x6306?
SELECT "Title" FROM table_30298 WHERE "Production code" = '3X6306'
SELECT "Title" FROM "table_30298" WHERE "Production code" = '3X6306'