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A056012 as a simple table

n a(n)
1 1
2 2
3 4
4 6
5 90
6 408
7 5856
8 2200352
9 11524640
10 90200997888

[1,2,4,6,90,408,5856,2200352,11524640,90200997888]

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Last modified September 14 13:32 EDT 2024. Contains 375921 sequences. (Running on oeis4.)