A126171
formatted as a simple table:
n
a(n)
1
0
2
0
3
2
4
6
5
22
6
62
7
189
8
444
9
1116
10
2594
11
6051
12
14141
[0,0,2,6,22,62,189,444,1116,2594,6051,14141]
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
)
Last modified December 11 12:57 EST 2009. Contains 170656 sequences.
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