A071540
formatted as a simple table:
n
a(n)
1
4
2
57
3
664
4
7068
5
73130
6
747244
7
7590269
[4,57,664,7068,73130,747244,7590269]
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
)
Last modified December 20 16:54 EST 2009. Contains 171081 sequences.
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