# A202365 (b-file synthesized from sequence entry)
0 1
1 1
2 2
3 10
4 54
5 336
6 2400
7 19440
8 176400
9 1774080
10 19595520
11 235872000
12 3073593600
13 43110144000
14 647610163200
15 10374216652800
16 176536039680000
17 3180264062976000
18 60466862776320000
19 1210048630382592000
20 25423825985445888000
21 559567461880627200000
22 12874917427270778880000