A119966
formatted as a simple table:
n
a(n)
0
1
1
2
2
6
3
28
4
220
5
2565
6
45846
7
1268622
8
55336336
9
3876385680
[1,2,6,28,220,2565,45846,1268622,55336336, 3876385680]
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Maintained by
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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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