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A221390 as a simple table

n a(n)
1 0
2 0
3 13
4 1198
5 52320
6 2204556
7 86673898
8 3361458245
9 128992693561
10 4928816080380
11 187851827622672
12 7150418585672281
13 271982464009887803
14 10341601574159713990
15 393139667142067892978
16 14943725056237306101598

[0,0,13,1198,52320,2204556,86673898,3361458245,
 128992693561,4928816080380,187851827622672,
 7150418585672281,271982464009887803,
 10341601574159713990,393139667142067892978,
 14943725056237306101598]

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Last modified May 19 05:04 EDT 2022. Contains 353826 sequences. (Running on oeis4.)