# A013297 (b-file synthesized from sequence entry)
0 0
1 1
2 6
3 90
4 2520
5 120960
6 9979200
7 1377295920
8 285145660800
9 78922558915200
10 27250976424672000
11 11359413770434329600
12 5628391828843104921600
13 3284252230408078849920000
14 2238997166752030045320960000