A001171
formatted as a simple table:
n
a(n)
1
1
2
1
3
4
4
20
5
148
6
1348
7
15104
8
198144
9
2998656
10
51290496
[1,1,4,20,148,1348,15104,198144,2998656,51290496]
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
)
Last modified November 27 22:38 EST 2009. Contains 167602 sequences.
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