A053890
formatted as a simple table:
n
a(n)
1
1
2
2
3
12
4
21
5
38
6
1188
7
20771
8
37962
9
3378512
10
11594538
11
65833989271
12
3798830532038
[1,2,12,21,38,1188,20771,37962,3378512,11594538, 65833989271,3798830532038]
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
)
Last modified December 15 00:47 EST 2009. Contains 170825 sequences.
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