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A006869
as a simple table
n
a(n)
4
1
5
2
6
7
7
18
8
52
9
133
10
330
11
762
12
1681
[1,2,7,18,52,133,330,762,1681]
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Last modified May 25 21:30 EDT 2013. Contains 225649 sequences.
