# A157384 (b-file synthesized from sequence entry) 1 1 2 1 3 4 4 1 5 12 6 20 7 1 8 72 9 80 10 120 11 1 12 280 13 1000 14 600 15 840 16 1 17 1740 18 9200 19 9000 20 5040 21 6720 22 1 23 8484 24 79100 25 138600 26 88200 27 47040 28 60480 29 1 30 57232 31 874720 32 1789200 33 1552320 34 940800 35 483840 36 604800 37 1 38 328752 39 9532880