# A012999 (b-file synthesized from sequence entry) 0 2 1 8 2 328 3 31712 4 6354304 5 2085514752 6 1027652193280 7 707087567055872 8 648127370395910144 9 763186372089893650432 10 1122739235799995992047616 11 2017897729638659884887834624 12 4350781970507936954099174998016