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A263866 as a simple table

n a(n)
2 0
3 4
4 12
5 84
6 548
7 4172
8 33984
9 315800
10 3213032

[0,4,12,84,548,4172,33984,315800,3213032]

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Last modified August 11 20:13 EDT 2022. Contains 356067 sequences. (Running on oeis4.)