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A007054 formatted as a simple table:

n a(n)
0 3
1 2
2 3
3 6
4 14
5 36
6 99
7 286
8 858
9 2652
10 8398
11 27132
12 89148
13 297160
14 1002915
15 3421710
16 11785890
17 40940460
18 143291610
19 504932340
20 1790214660
21 6382504440
22 22870640910 

[3,2,3,6,14,36,99,286,858,2652,8398,27132,89148,
 297160,1002915,3421710,11785890,40940460,
 143291610,504932340,1790214660,6382504440,
 22870640910]

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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.

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