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A018981 as a simple table

n a(n)
2 0
3 6
4 24
5 192
6 924
7 6432
8 39096
9 251712
10 1601904
11 10498200
12 69861552
13 472556352
14 3225921672
15 22211011704
16 154049303808 

[0,6,24,192,924,6432,39096,251712,1601904,
 10498200,69861552,472556352,3225921672,
 22211011704,154049303808]

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Last modified April 20 11:10 EDT 2024. Contains 371838 sequences. (Running on oeis4.)