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A168631 as a simple table

n a(n)
0 0
1 1
2 4128
3 797526
4 33556480
5 610359375
6 6530370336
7 48444564028
8 274878038016
9 1270933179885
10 5000000500000
11 17261356957746
12 53496604182528
13 151437555709531
14 396857390391840
15 973097539875000
16 2251799822073856

[0,1,4128,797526,33556480,610359375,6530370336,
 48444564028,274878038016,1270933179885,
 5000000500000,17261356957746,53496604182528,
 151437555709531,396857390391840,973097539875000,
 2251799822073856]

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Last modified December 6 16:24 EST 2019. Contains 329808 sequences. (Running on oeis4.)