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A001930 as a simple table

n a(n)
0 1
1 1
2 3
3 9
4 33
5 139
6 718
7 4535
8 35979
9 363083
10 4717687
11 79501654
12 1744252509
13 49872339897
14 1856792610995
15 89847422244493
16 5637294117525695 

[1,1,3,9,33,139,718,4535,35979,363083,4717687,
 79501654,1744252509,49872339897,1856792610995,
 89847422244493,5637294117525695]

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Last modified May 24 09:26 EDT 2013. Contains 225617 sequences.