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A090138 as a simple table

n a(n)
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

[1,1,6,3,40,90,336,56,51840,226800,4435200,
 11975040,188697600,1210809600,100590336000,
 93405312000,23712495206400,2598365952000,
 6360528125952,3754478407680000,537799391281152000,
 802857662698291200]

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Last modified January 28 12:30 EST 2023. Contains 359876 sequences. (Running on oeis4.)