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A000913 formatted as a simple table:

n a(n)
1 0
2 1
3 2
4 12
5 38
6 143
7 490
8 1768
9 6268
10 22610
11 81620
12 297160
13 1086172
14 3991995
15 14731290
16 54587280
17 202992808
18 757398510
19 2834493948
20 10637507400
21 40023577524
22 150946230006
23 570534370692
24 2160865067312
25 8199710635816

[0,1,2,12,38,143,490,1768,6268,22610,81620,297160,
 1086172,3991995,14731290,54587280,202992808,
 757398510,2834493948,10637507400,40023577524,
 150946230006,570534370692,2160865067312,
 8199710635816]

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Last modified December 2 11:54 EST 2009. Contains 167921 sequences.


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