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A006246
as a simple table
n
a(n)
1
1
2
1
3
1
4
2
5
3
6
20
7
242
8
6405
9
316835
10
28627261
11
4686329954
[1,1,1,2,3,20,242,6405,316835,28627261,4686329954]
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Last modified April 18 15:16 EDT 2024. Contains 371780 sequences. (Running on oeis4.)