A122588
formatted as a simple table:
n
a(n)
1
1
2
9
3
53
4
260
5
1156
6
4845
7
19551
8
76912
9
297275
10
1134705
11
4292145
12
16128061
13
60304951
14
224660626
15
834641671
[1,9,53,260,1156,4845,19551,76912,297275,1134705, 4292145,16128061,60304951,224660626,834641671]
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
)
Last modified December 10 12:37 EST 2009. Contains 170569 sequences.
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