A014559
formatted as a simple table:
n
a(n)
0
1
1
2
2
6
3
19
4
53
5
216
6
760
7
2725
8
9910
9
39446
10
125268
[1,2,6,19,53,216,760,2725,9910,39446,125268]
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
)
Last modified December 21 10:15 EST 2009. Contains 171081 sequences.
AT&T Labs Research
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