# A375812 (b-file synthesized from sequence entry)
0 1
1 2
2 6
3 24
4 144
5 1080
6 9360
7 92400
8 1038240
9 13063680
10 181137600
11 2744280000
12 45145900800
13 801313793280
14 15256927445760
15 310158565516800
16 6705376386508800
17 153609543947059200
18 3716764672074854400
19 94715288771578675200
20 2535525218048030208000