# A218566 (b-file synthesized from sequence entry)
1 0
2 1
3 3
4 2
5 12
6 240
7 3
8 27
9 1080
10 226800
11 4
12 48
13 2880
14 1209600
15 3657830400
16 5
17 75
18 6000
19 3780000
20 22861440000
21 1267438233600000
22 6
23 108
24 10800
25 9072000
26 82301184000
27 9125555281920000
28 11274806061917798400000