A049021
formatted as a simple table:
n
a(n)
0
1
1
1
2
2
3
7
4
23
5
116
6
683
7
4866
[1,1,2,7,23,116,683,4866]
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
)
Last modified December 4 23:11 EST 2009. Contains 170347 sequences.
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