A001691
formatted as a simple table:
n
a(n)
2
1
3
9
4
108
5
3420
6
114480
7
7786800
[1,9,108,3420,114480,7786800]
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
)
Last modified December 4 08:07 EST 2009. Contains 170310 sequences.
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