A147364 - OEIS

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A147364 as a simple table

n	a(n)
1	1
2	1
3	1
4	1
5	1
6	1
7	2
8	3
9	6
10	9
11	16
12	23
13	72
14	173
15	621
16	1620
17	5393
18	14347
19	63207
20	232978
21	1333190
22	5780677
23	34593611
24	163090674
25	1165840626
26	6871746297

[1,1,1,1,1,1,2,3,6,9,16,23,72,173,621,1620,5393, 14347,63207,232978,1333190,5780677,34593611, 163090674,1165840626,6871746297]