A053912
formatted as a simple table:
n
a(n)
1
1
2
9
3
109
4
280859
5
105769141
6
279067891
[1,9,109,280859,105769141,279067891]
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
)
Last modified November 25 20:09 EST 2009. Contains 167514 sequences.
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