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A109618 as a simple table

n a(n)
1 0
2 0
3 0
4 2
5 8
6 56
7 482
8 6374
9 116980
10 3089024
11 115321068
12 6150672392

[0,0,0,2,8,56,482,6374,116980,3089024,115321068,
 6150672392]

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Last modified May 3 02:00 EDT 2024. Contains 372203 sequences. (Running on oeis4.)