# A277211 (b-file synthesized from sequence entry) 0 1 1 2 2 6 3 24 4 130 5 960 6 9702 7 134512 8 2562516 9 67152240 10 2422643366 11 120395521752 12 8245524190254 13 778511553019200 14 101361018574446630 15 18202576574465956224 16 4509516189662784365688 17 1541444043912873505870464 18 727078284287957812245097914