A000644
formatted as a simple table:
n
a(n)
0
1
1
1
2
3
3
7
4
31
5
138
6
808
7
4956
8
33047
9
227328
[1,1,3,7,31,138,808,4956,33047,227328]
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
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Last modified December 7 08:40 EST 2009. Contains 170430 sequences.
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