A147224 - OEIS

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A147224 as a simple table

n	a(n)
1	1
2	1
3	1
4	1
5	15
6	5
7	62
8	17
9	602
10	89
11	29524
12	5783
13	1544922
14	270221
15	203301503
16	19830584
17	60493044496
18	4522566093
19	26251057879932
20	1590451774176
21	23899128298949817
22	1088025398592657

[1,1,1,1,15,5,62,17,602,89,29524,5783,1544922, 270221,203301503,19830584,60493044496,4522566093, 26251057879932,1590451774176,23899128298949817, 1088025398592657]