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A197999 as a simple table

n a(n)
1 1
2 4
3 22
4 216
5 3947
6 122529
7 6627405
8 625861278
9 105953231415

[1,4,22,216,3947,122529,6627405,625861278,
 105953231415]

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Last modified April 24 11:01 EDT 2024. Contains 371936 sequences. (Running on oeis4.)