A146787 - OEIS

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A146787 as a simple table

n	a(n)
1	1
2	1
3	1
4	1
5	1
6	1
7	3
8	5
9	11
10	21
11	39
12	105
13	351
14	1205
15	4629
16	16631
17	70563
18	335933
19	1961161
20	12194507
21	84627809
22	599408761

[1,1,1,1,1,1,3,5,11,21,39,105,351,1205,4629,16631, 70563,335933,1961161,12194507,84627809,599408761]