A002907
formatted as a simple table:
n
a(n)
0
2
1
2
2
20
3
38
4
146
5
368
6
1070
7
2824
8
7680
9
19996
[2,2,20,38,146,368,1070,2824,7680,19996]
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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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