# A375699 (b-file synthesized from sequence entry) 0 1 1 0 2 0 3 0 4 4 5 10 6 40 7 210 8 5264 9 45360 10 409800 11 4065600 12 77948640 13 1183422240 14 17527233360 15 267109642800 16 5422495921920 17 110998923235200 18 2270809072896000 19 47142009514454400 20 1116394268619772800 21 27963045712157472000 22 718066383283082803200