A147409 - OEIS

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A147409 as a simple table

n	a(n)
1	1
2	1
3	1
4	1
5	1
6	1
7	1
8	1
9	1
10	3
11	7
12	13
13	21
14	31
15	61
16	147
17	365
18	1043
19	3041
20	10027
21	33377
22	115807
23	406723
24	1580475
25	6700609

[1,1,1,1,1,1,1,1,1,3,7,13,21,31,61,147,365,1043, 3041,10027,33377,115807,406723,1580475,6700609]