A147105 - OEIS

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A147105 as a simple table

n	a(n)
1	1
2	1
3	1
4	1
5	1
6	1
7	1
8	3
9	13
10	21
11	51
12	105
13	313
14	705
15	2345
16	6341
17	26177
18	91001
19	474255
20	1837677
21	10745995
22	49191077
23	334389565
24	1781473499

[1,1,1,1,1,1,1,3,13,21,51,105,313,705,2345,6341, 26177,91001,474255,1837677,10745995,49191077, 334389565,1781473499]