Name the series number that aired on november 11, 1996
CREATE TABLE "table1_18646432_1" (
  "series_num" text,
  "title" text,
  "directed_by" text,
  "written_by" text,
  "original_air_date" text,
  "prod_code" real
);
SELECT "series_num" FROM "table1_18646432_1" WHERE "original_air_date"='November 11, 1996';