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A000868 as a simple table

n a(n)
1 4
2 21
3 1531
4 44782251
5 96076794891512491
6 886151997189943927518995693301312171
7 150770949527755462791108053396729046910357127815416821444325531778055580331

[4,21,1531,44782251,96076794891512491,
 886151997189943927518995693301312171,
 15077094952775546279110805339672904691035712781541\
 6821444325531778055580331]

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Last modified March 1 15:29 EST 2024. Contains 370440 sequences. (Running on oeis4.)