Which Away team that has a Crowd greater than 15,481, and a Home team score of 20.17 (137)?
CREATE TABLE "round_5" (
  "home_team" text,
  "home_team_score" text,
  "away_team" text,
  "away_team_score" text,
  "venue" text,
  "crowd" real,
  "date" text
);
SELECT "away_team" FROM "round_5" WHERE "crowd">'15,481' AND "home_team_score"='20.17 (137)';