A109456
formatted as a simple table:
n
a(n)
0
0
1
1
2
1
3
2
4
3
5
7
6
21
7
135
8
2470
9
319124
10
1214554343
[0,1,1,2,3,7,21,135,2470,319124,1214554343]
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
)
Last modified December 5 17:24 EST 2009. Contains 170342 sequences.
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