# A219118 (b-file synthesized from sequence entry) 0 1 1 1 2 4 3 24 4 296 5 4280 6 79032 7 1978368 8 57803776 9 1949421888 10 78945675200 11 3678493774560 12 190462000632576 13 11112878148649472 14 730288018660087552 15 52727783838765181440 16 4148774572438335014912 17 358041540338404096024576 18 33700760914469383117799424