A147065 - OEIS

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A147065 as a simple table

n	a(n)
1	1
2	1
3	1
4	1
5	1
6	1
7	4
8	7
9	20
10	27
11	84
12	153
13	692
14	1605
15	7549
16	19036
17	103045
18	315223
19	2201412
20	8341738
21	68161042
22	299153867
23	2851751081
24	14915115066

[1,1,1,1,1,1,4,7,20,27,84,153,692,1605,7549,19036, 103045,315223,2201412,8341738,68161042,299153867, 2851751081,14915115066]