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A151807
as a simple table
n
a(n)
1
2
2
4
3
21
4
330
5
14610
6
1820715
7
653629616
8
667836415941
9
1773036223008518
[2,4,21,330,14610,1820715,653629616,667836415941, 1773036223008518]
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Last modified May 6 02:22 EDT 2024. Contains 372290 sequences. (Running on oeis4.)