A157596 - OEIS

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A157596 as a simple table

n	a(n)
2	1
3	3
4	6
5	27310
6	4493895
7	469762041
8	39763084319
9	3062924462367
10	231122336887800
11	16732612596774745
12	1176767971442596731
13	80630592887297229153
14	5290690279278336041746
15	330378602282944731759075

[1,3,6,27310,4493895,469762041,39763084319, 3062924462367,231122336887800,16732612596774745, 1176767971442596731,80630592887297229153, 5290690279278336041746,330378602282944731759075]