# A232983 (b-file synthesized from sequence entry)
0 1
1 1
2 2
3 6
4 24
5 120
6 720
7 720
8 5760
9 51840
10 518400
11 5702400
12 68428800
13 889574400
14 889574400
15 13343616000
16 213497856000
17 3629463552000
18 65330343936000
19 1241276534784000
20 24825530695680000
21 24825530695680000
22 546161675304960000
23 12561718532014080000
24 301481244768337920000
25 7537031119208448000000