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A221387 as a simple table

n a(n)
1 0
2 918
3 284702
4 86673898
5 25415184702
6 7392392443622
7 2142967506078650
8 620488065801083664
9 179590766393598824048

[0,918,284702,86673898,25415184702,7392392443622,
 2142967506078650,620488065801083664,
 179590766393598824048]

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Last modified January 21 18:19 EST 2022. Contains 350479 sequences. (Running on oeis4.)