A039777
formatted as a simple table:
n
a(n)
1
2
2
5
3
21
4
45
5
285
6
765
7
27645
8
196605
9
41067645
10
72787965
[2,5,21,45,285,765,27645,196605,41067645,72787965]
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
)
Last modified December 16 17:18 EST 2009. Contains 170825 sequences.
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