A146411 - OEIS

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A146411 as a simple table

n	a(n)
1	1
2	1
3	1
4	1
5	1
6	1
7	7
8	21
9	45
10	89
11	233
12	863
13	3251
14	15437
15	73625
16	393971
17	2328247
18	15894743
19	120359659
20	1040197243
21	9831811849
22	105976019467

[1,1,1,1,1,1,7,21,45,89,233,863,3251,15437,73625, 393971,2328247,15894743,120359659,1040197243, 9831811849,105976019467]