A147010 - OEIS

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A147010 as a simple table

n	a(n)
1	1
2	1
3	1
4	1
5	3
6	5
7	9
8	19
9	56
10	167
11	758
12	2457
13	14728
14	66625
15	526225
16	3298653
17	34425031
18	276512141
19	3848586911
20	41626261490

[1,1,1,1,3,5,9,19,56,167,758,2457,14728,66625, 526225,3298653,34425031,276512141,3848586911, 41626261490]