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A144691 formatted as a simple table:

n a(n)
0 1
1 1
2 2
3 4
4 26
5 106
6 816
7 4292
8 90162
9 715138
10 10275886
11 87498566
12 1944309280
13 20988667064
14 351769697800
15 3865796198136 

[1,1,2,4,26,106,816,4292,90162,715138,10275886,
 87498566,1944309280,20988667064,351769697800,
 3865796198136]

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Last modified December 16 17:18 EST 2009. Contains 170825 sequences.

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