A007171
formatted as a simple table:
n
a(n)
1
1
2
2
3
4
4
16
5
89
6
579
7
3989
8
28630
9
210847
10
1584308
[1,2,4,16,89,579,3989,28630,210847,1584308]
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
)
Last modified November 29 12:46 EST 2009. Contains 167659 sequences.
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