# A155583 (b-file synthesized from sequence entry)
0 1
1 1
2 2
3 6
4 12
5 28
6 36
7 36
8 216
9 216
10 720
11 1512
12 1512
13 2520
14 12096
15 12096
16 12096
17 10080
18 60480
19 108864
20 108864
21 54432
22 604800
23 604800
24 1088640
25 544320
26 326592