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A003456 formatted as a simple table:

n a(n)
3 1
4 2
5 5
6 17
7 62
8 275
9 1272
10 6225
11 31075
12 158376
13 816229
14 4251412
15 23319056
16 117998524
17 627573216
18 3355499036
19 18025442261
20 97239773408
21 526560862829

[1,2,5,17,62,275,1272,6225,31075,158376,816229,
 4251412,23319056,117998524,627573216,3355499036,
 18025442261,97239773408,526560862829]

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Last modified December 4 15:11 EST 2009. Contains 170347 sequences.


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