A064769
formatted as a simple table:
n
a(n)
1
1
2
2
3
3
4
5
5
9
6
17
7
65
8
222
9
1720
[1,2,3,5,9,17,65,222,1720]
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
)
Last modified December 6 22:55 EST 2009. Contains 170429 sequences.
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