A090051
formatted as a simple table:
n
a(n)
0
1
1
20
2
400
3
1862
4
9373
5
51323
6
298821
7
1965313
8
11759158
[1,20,400,1862,9373,51323,298821,1965313,11759158]
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
)
Last modified November 30 13:13 EST 2009. Contains 167758 sequences.
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