A002091
formatted as a simple table:
n
a(n)
1
3
2
9
3
19
4
21
5
55
6
115
7
193
8
323
9
611
10
1081
11
1571
12
10771
13
13067
14
16321
15
44881
16
57887
17
93167
18
189947
[3,9,19,21,55,115,193,323,611,1081,1571,10771, 13067,16321,44881,57887,93167,189947]
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
)
Last modified November 29 12:46 EST 2009. Contains 167659 sequences.
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