A002811
formatted as a simple table:
n
a(n)
1
1
2
5
3
23
4
1681
5
257543
6
67637281
7
27138236663
8
15442193173681
[1,5,23,1681,257543,67637281,27138236663, 15442193173681]
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
)
Last modified December 17 23:40 EST 2009. Contains 171025 sequences.
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