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A000109 as a simple table

n a(n)
3 1
4 1
5 1
6 2
7 5
8 14
9 50
10 233
11 1249
12 7595
13 49566
14 339722
15 2406841
16 17490241
17 129664753
18 977526957
19 7475907149
20 57896349553
21 453382272049
22 3585853662949
23 28615703421545 

[1,1,1,2,5,14,50,233,1249,7595,49566,339722,
 2406841,17490241,129664753,977526957,7475907149,
 57896349553,453382272049,3585853662949,
 28615703421545]

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Last modified May 22 10:40 EDT 2013. Contains 225526 sequences.