A073964
formatted as a simple table:
n
a(n)
1
0
2
2
3
6
4
20
5
100
6
600
7
3150
8
15750
9
78000
10
390000
[0,2,6,20,100,600,3150,15750,78000,390000]
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
)
Last modified December 20 16:54 EST 2009. Contains 171081 sequences.
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