A005580
formatted as a simple table:
n
a(n)
2
3
3
8
4
21
5
54
6
141
7
372
8
995
9
2697
10
7397
11
20502
12
57347
13
161658
[3,8,21,54,141,372,995,2697,7397,20502,57347, 161658]
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(
njas@research.att.com
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Last modified December 17 23:40 EST 2009. Contains 171025 sequences.
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