A019504
formatted as a simple table:
n
a(n)
1
1
2
2
3
5
4
16
5
67
6
324
7
1820
[1,2,5,16,67,324,1820]
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
)
Last modified December 10 12:32 EST 2009. Contains 170569 sequences.
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