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A331640 as a simple table

n a(n)
0 1
1 0
2 6
3 120
4 6174
5 449520
6 49686726
7 7455901320
8 1479839874414
9 373573957133280
10 117097298726892246
11 44596327028174342520
12 20287402287658565190654
13 10864410524883717498300240
14 6765647366010527963979060966
15 4847736403559133115838948559720

[1,0,6,120,6174,449520,49686726,7455901320,
 1479839874414,373573957133280,117097298726892246,
 44596327028174342520,20287402287658565190654,
 10864410524883717498300240,
 6765647366010527963979060966,
 4847736403559133115838948559720]

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Last modified January 28 18:02 EST 2022. Contains 350657 sequences. (Running on oeis4.)