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A009680 as a simple table

n a(n)
1 1
2 0
3 12
4 336
5 15760
6 1144704
7 117385920
8 16206548736
9 2897776619776
10 651455951990784
11 179856295521635328
12 59822762558026321920
13 23594335379577078059008
14 10887666560228980302446592

[1,0,12,336,15760,1144704,117385920,16206548736,
 2897776619776,651455951990784,179856295521635328,
 59822762558026321920,23594335379577078059008,
 10887666560228980302446592]

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Last modified January 24 04:35 EST 2020. Contains 331183 sequences. (Running on oeis4.)