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A001691 as a simple table

n a(n)
1 0
2 1
3 9
4 108
5 3420
6 114480
7 7786800
8 497266560
9 42616445760
10 4320959126400
11 534444478444800
12 77699101730342400
13 13282131639801024000

[0,1,9,108,3420,114480,7786800,497266560,
 42616445760,4320959126400,534444478444800,
 77699101730342400,13282131639801024000]

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Last modified March 28 10:31 EDT 2024. Contains 371240 sequences. (Running on oeis4.)