# A037769 (b-file synthesized from sequence entry) 1 3 2 24 3 194 4 1553 5 12427 6 99416 7 795330 8 6362641 9 50901131 10 407209048 11 3257672386 12 26061379089 13 208491032715 14 1667928261720 15 13343426093762 16 106747408750097 17 853979270000779 18 6831834160006232