A007577
formatted as a simple table:
n
a(n)
0
1
1
20
2
400
3
8902
4
197281
5
4865577
6
119057155
7
3194833218
[1,20,400,8902,197281,4865577,119057155, 3194833218]
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
)
Last modified December 15 00:47 EST 2009. Contains 170825 sequences.
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