# A169637 (b-file synthesized from sequence entry)
0 1
1 1
2 1
3 4
4 20
5 60
6 420
7 3360
8 15120
9 151200
10 831600
11 3326400
12 43243200
13 302702400
14 1513512000
15 24216192000
16 411675264000
17 3705077376000
18 70396470144000
19 703964701440000
20 14783258730240000
21 162615846032640000
22 1246721486250240000
23 7480328917501440000