# A027522 (b-file synthesized from sequence entry) 1 1 2 1 3 4 4 9 5 450 6 14700 7 23716 8 11025 9 5929 10 3025 11 27225 12 14400 13 42688800 14 3870830656 15 9109748025 16 5288198400 17 1599516800 18 1903751424 19 57588480576 20 12696964358400 21 7957646064900 22 138654025034817600 23 2784183915021140193408 24 1052240403785569432896