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A331883 as a simple table

n a(n)
1 0
2 1
3 1
4 5
5 26
6 132
7 834
8 6477
9 56242

[0,1,1,5,26,132,834,6477,56242]

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Last modified June 15 01:46 EDT 2021. Contains 345041 sequences. (Running on oeis4.)