A077460
formatted as a simple table:
n
a(n)
0
1
1
1
2
1
3
3
4
12
5
70
6
464
7
3482
8
27779
9
233556
[1,1,1,3,12,70,464,3482,27779,233556]
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Maintained by
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(
njas@research.att.com
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Last modified December 8 08:31 EST 2009. Contains 170430 sequences.
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