A130649
formatted as a simple table:
n
a(n)
0
1
1
2
2
8
3
42
4
260
5
1796
6
13372
7
104922
8
854964
9
7165500
[1,2,8,42,260,1796,13372,104922,854964,7165500]
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
)
Last modified December 11 12:57 EST 2009. Contains 170656 sequences.
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