A000372
formatted as a simple table:
n
a(n)
0
2
1
3
2
6
3
20
4
168
5
7581
6
7828354
7
2414682040998
8
56130437228687557907788
[2,3,6,20,168,7581,7828354,2414682040998, 56130437228687557907788]
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
)
Last modified December 17 23:40 EST 2009. Contains 171025 sequences.
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