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A270578 as a simple table

n a(n)
2 20
3 491
4 7502
5 52013
6 297464
7 1119791
8 3900890
9 11135201
10 29329232

[20,491,7502,52013,297464,1119791,3900890,
 11135201,29329232]

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Last modified June 29 15:47 EDT 2022. Contains 354913 sequences. (Running on oeis4.)