A146797 - OEIS

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A146797 as a simple table

n	a(n)
1	1
2	1
3	1
4	1
5	1
6	1
7	5
8	15
9	37
10	67
11	105
12	399
13	1261
14	4027
15	19513
16	89607
17	517461
18	2695467
19	14080529
20	92973015
21	632822045

[1,1,1,1,1,1,5,15,37,67,105,399,1261,4027,19513, 89607,517461,2695467,14080529,92973015,632822045]