A125722
formatted as a simple table:
n
a(n)
1
0
2
20
3
630
4
13120
5
224120
6
3420020
7
48460020
8
651939020
9
8439739020
[0,20,630,13120,224120,3420020,48460020,651939020, 8439739020]
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
)
Last modified December 5 08:23 EST 2009. Contains 170348 sequences.
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