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A006986
as a simple table
n
a(n)
1
1
2
1
3
2
4
7
5
23
6
114
7
625
8
3974
[1,1,2,7,23,114,625,3974]
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Last modified April 24 08:13 EDT 2024. Contains 371922 sequences. (Running on oeis4.)