# A090138 (b-file synthesized from sequence entry)
1 1
2 1
3 6
4 3
5 40
6 90
7 336
8 56
9 51840
10 226800
11 4435200
12 11975040
13 188697600
14 1210809600
15 100590336000
16 93405312000
17 23712495206400
18 2598365952000
19 6360528125952
20 3754478407680000
21 537799391281152000
22 802857662698291200