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A001573 formatted as a simple table:

n a(n)
1 1
2 2
3 4
4 9
5 23
6 63
7 177
8 514
9 1527
10 4625
11 14230
12 44357
13 139779
14 444558
15 1425151
16 4600339
17 14939849
18 48778197
19 160019885
20 527200711 

[1,2,4,9,23,63,177,514,1527,4625,14230,44357,
 139779,444558,1425151,4600339,14939849,48778197,
 160019885,527200711]

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Last modified December 9 14:43 EST 2009. Contains 170430 sequences.

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