A087983
formatted as a simple table:
n
a(n)
1
2
2
3
3
6
4
16
5
51
6
220
7
1179
[2,3,6,16,51,220,1179]
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
)
Last modified December 6 13:45 EST 2009. Contains 170429 sequences.
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