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A000131 formatted as a simple table:

n a(n)
7 2
8 5
9 21
10 61
11 214
12 669
13 2240
14 7330
15 24695
16 83257
17 284928
18 981079
19 3410990
20 11937328
21 42075242
22 149171958
23 531866972
24 1905842605
25 6861162880

[2,5,21,61,214,669,2240,7330,24695,83257,284928,
 981079,3410990,11937328,42075242,149171958,
 531866972,1905842605,6861162880]

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Last modified December 8 08:31 EST 2009. Contains 170430 sequences.


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