A001532
formatted as a simple table:
n
a(n)
0
1
1
1
2
2
3
3
4
7
5
21
6
135
7
2470
8
175428
[1,1,2,3,7,21,135,2470,175428]
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
)
Last modified December 7 08:40 EST 2009. Contains 170430 sequences.
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