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A087636 as a simple table

n a(n)
1 0
2 18
3 81
4 1539
5 20457
6 242217
7 2894799
8 33535839
9 381591711

[0,18,81,1539,20457,242217,2894799,33535839,
 381591711]

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Last modified June 13 00:57 EDT 2021. Contains 344980 sequences. (Running on oeis4.)