A002721
formatted as a simple table:
n
a(n)
0
1
1
12
2
132
3
847
4
3921
5
14506
6
45402
7
124707
8
308407
9
699766
[1,12,132,847,3921,14506,45402,124707,308407, 699766]
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
)
Last modified November 29 12:46 EST 2009. Contains 167659 sequences.
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