A002841
formatted as a simple table:
n
a(n)
3
1
4
1
5
2
6
6
7
16
8
50
9
165
10
554
11
1908
12
6667
13
23556
[1,1,2,6,16,50,165,554,1908,6667,23556]
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(
njas@research.att.com
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Last modified December 17 23:40 EST 2009. Contains 171025 sequences.
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