# A001626 (b-file synthesized from sequence entry) 1 0 2 0 3 2 4 36 5 840 6 29680 7 1429920 8 90318144 9 7237943552 10 717442928640 11 86171602072320 12 12331048749268480 13 2072725870491859968 14 404352831489304049664 15 90605920564322676531200 16 23110943021722435879157760 17 6657484407493222296916131840