A091640
formatted as a simple table:
n
a(n)
1
4
2
23
3
136
4
897
5
6367
6
46706
7
355148
8
2770239
9
21984207
10
176966593
11
1440765209
12
11838096715
[4,23,136,897,6367,46706,355148,2770239,21984207, 176966593,1440765209,11838096715]
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
)
Last modified December 5 23:38 EST 2009. Contains 170428 sequences.
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