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A303415 as a simple table

n a(n)
1 1
2 8
3 252
4 30897
5 14783632
6 27575294129
7 200493397340704
8 5683010875200460450
9 627998579658329070097348
10 270542136528524318473547313146
11 454367389836320183421616246521390670

[1,8,252,30897,14783632,27575294129,
 200493397340704,5683010875200460450,
 627998579658329070097348,
 270542136528524318473547313146,
 454367389836320183421616246521390670]

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Last modified October 20 18:00 EDT 2021. Contains 348111 sequences. (Running on oeis4.)