A145075
formatted as a simple table:
n
a(n)
0
1
1
4
2
18
3
172
4
1881
5
25644
6
411488
[1,4,18,172,1881,25644,411488]
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
)
Last modified December 6 13:45 EST 2009. Contains 170429 sequences.
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