A132404
formatted as a simple table:
n
a(n)
1
3
2
20
3
60
4
204
5
-1
6
420
7
660
8
2040
[3,20,60,204,-1,420,660,2040]
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
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Last modified December 10 00:48 EST 2009. Contains 170565 sequences.
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