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A000863 as a simple table

n a(n)
1 4
2 19
3 632
4 19245637
5 5158701627878530987
6 101362012359740449534162019620212891642247346

[4,19,632,19245637,5158701627878530987,
 101362012359740449534162019620212891642247346]

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Last modified August 3 15:54 EDT 2021. Contains 346439 sequences. (Running on oeis4.)