# 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