# A157398 (b-file synthesized from sequence entry) 1 1 2 1 3 4 4 1 5 12 6 28 7 1 8 72 9 112 10 280 11 1 12 280 13 1400 14 1400 15 3640 16 1 17 1740 18 15120 19 21000 20 21840 21 58240 22 1 23 8484 24 126420 25 401800 26 382200 27 407680 28 1106560 29 1 30 57232 31 1538208 32 6370000 33 8357440 34 8153600 35 8852480 36 24344320 37 1