A117106
formatted as a simple table:
n
a(n)
1
1
2
2
3
6
4
23
5
104
6
530
7
2958
8
17734
9
112657
10
750726
11
5207910
12
37387881
13
276467208
[1,2,6,23,104,530,2958,17734,112657,750726, 5207910,37387881,276467208]
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
)
Last modified December 15 00:47 EST 2009. Contains 170825 sequences.
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