A287888 - OEIS

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A287888 as a simple table

n	a(n)
1	1
2	1
3	2
4	5
5	14
6	47
7	170
8	676
9	2834
10	12471
11	56675
12	264906
13	1264851
14	6150187
15	30357300
16	151798497
17	767573729
18	3919462385

[1,1,2,5,14,47,170,676,2834,12471,56675,264906, 1264851,6150187,30357300,151798497,767573729, 3919462385]