A067680
formatted as a simple table:
n
a(n)
1
6
2
21
3
54
4
75
5
441
6
1071
7
4191
8
9315
9
58311
10
4197375
11
7685151
12
36997695
13
268460031
14
1073790975
15
17180065791
[6,21,54,75,441,1071,4191,9315,58311,4197375, 7685151,36997695,268460031,1073790975, 17180065791]
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Maintained by
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(
njas@research.att.com
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Last modified November 27 14:50 EST 2009. Contains 167570 sequences.
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