A157602 - OEIS

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A157602 as a simple table

n	a(n)
2	1
3	9
4	378
5	39990
6	6207435
7	649615491
8	61839617931
9	5291171373321
10	436429418237100
11	34318546032095787
12	2635382197485052125
13	197482663359487272702
14	14177933118661639661880
15	968391907322785974064260

[1,9,378,39990,6207435,649615491,61839617931, 5291171373321,436429418237100,34318546032095787, 2635382197485052125,197482663359487272702, 14177933118661639661880,968391907322785974064260]