A147063 - OEIS

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A147063 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	74
14	177
15	647
16	1682
17	5837
18	15849
19	74186
20	276554
21	1634940
22	7124985
23	45487535
24	222097984
25	1721224041
26	10469414217
27	99805923832

[1,1,1,1,1,1,2,3,6,9,16,23,74,177,647,1682,5837, 15849,74186,276554,1634940,7124985,45487535, 222097984,1721224041,10469414217,99805923832]