A006226
formatted as a simple table:
n
a(n)
1
1
2
2
3
9
4
18
5
118
6
239
7
1594
[1,2,9,18,118,239,1594]
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N. J. A. Sloane
(
njas@research.att.com
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Last modified December 15 00:47 EST 2009. Contains 170825 sequences.
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