A003212
formatted as a simple table:
n
a(n)
0
1
1
4
2
12
3
36
4
108
5
264
6
708
7
1668
8
4536
9
10926
10
28416
[1,4,12,36,108,264,708,1668,4536,10926,28416]
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
)
Last modified December 17 19:39 EST 2009. Contains 170821 sequences.
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