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A221554
as a simple table
n
a(n)
1
4
2
494
3
47976
4
4107189
5
354947070
6
30632388919
7
2643033185667
8
228021702640082
9
19671424819923462
[4,494,47976,4107189,354947070,30632388919, 2643033185667,228021702640082,19671424819923462]
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Last modified August 31 14:46 EDT 2024. Contains 375567 sequences. (Running on oeis4.)