A007631
formatted as a simple table:
n
a(n)
4
2
5
4
6
0
7
2
8
10
9
32
10
38
11
140
12
496
13
1186
14
3178
15
16792
16
82038
17
289566
[2,4,0,2,10,32,38,140,496,1186,3178,16792,82038, 289566]
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(
njas@research.att.com
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Last modified December 15 00:47 EST 2009. Contains 170825 sequences.
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