A068797
formatted as a simple table:
n
a(n)
1
2
2
1
3
6
4
15
5
60
6
726
7
6318
8
189375
9
755968
10
683441871
11
33714015615
[2,1,6,15,60,726,6318,189375,755968,683441871, 33714015615]
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
)
Last modified December 1 19:22 EST 2009. Contains 167811 sequences.
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