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A002857 as a simple table

n a(n)
1 1
2 3
3 20
4 996
5 9333312
6 6406603084568576
7 16879085743296493582043922521915392
8 717956902513121252476003434439730211917452457474409186632352788205535232 

[1,3,20,996,9333312,6406603084568576,
 16879085743296493582043922521915392,
 71795690251312125247600343443973021191745245747440\
 9186632352788205535232]

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Last modified April 16 18:22 EDT 2024. Contains 371750 sequences. (Running on oeis4.)