NAME THE Playoffs that HAVE a League of npsl, and a Open Cup of did not enter, and a Year of 2013?
CREATE TABLE "year_by_year" (
  "year" text,
  "division" real,
  "league" text,
  "regular_season" text,
  "playoffs" text,
  "open_cup" text
);
SELECT "playoffs" FROM "year_by_year" WHERE "league"='npsl' AND "open_cup"='did not enter' AND "year"='2013';