A056041
formatted as a simple table:
n
a(n)
0
2
1
3
2
5
3
7
4
23
5
63
6
383
7
2047
[2,3,5,7,23,63,383,2047]
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N. J. A. Sloane
(
njas@research.att.com
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Last modified November 30 13:13 EST 2009. Contains 167758 sequences.
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