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A186001 as a simple table

n a(n)
0 1
1 1
2 2
3 5
4 15
5 52
6 205
7 917
8 4658
9 26817
10 173899
11 1257916
12 10036409
13 87351977
14 821268402
15 8273013085
16 88696718215
17 1006586902196
18 12037812901733
19 151136735414301
20 1985815346287906

[1,1,2,5,15,52,205,917,4658,26817,173899,1257916,
 10036409,87351977,821268402,8273013085,
 88696718215,1006586902196,12037812901733,
 151136735414301,1985815346287906]

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Last modified December 17 16:30 EST 2014. Contains 252031 sequences.