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A051999 as a simple table

n a(n)
1 4
2 15
3 255
4 5865
5 170085
6 5437705
7 226473065
8 10380578845
9 494390700895
10 43592479037107

[4,15,255,5865,170085,5437705,226473065,
 10380578845,494390700895,43592479037107]

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Last modified May 26 04:46 EDT 2019. Contains 323579 sequences. (Running on oeis4.)