A002047
formatted as a simple table:
n
a(n)
0
1
1
2
2
6
3
28
4
244
5
2544
6
35600
7
659632
8
15106128
9
425802176
[1,2,6,28,244,2544,35600,659632,15106128, 425802176]
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
)
Last modified December 13 23:45 EST 2009. Contains 170824 sequences.
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