A081133 - OEIS

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A081133 as a simple table

n	a(n)
0	1
1	3
2	24
3	270
4	3840
5	65625
6	1306368
7	29647548
8	754974720
9	21308126895
10	660000000000
11	22254310307658
12	811365140791296
13	31801886192186565
14	1333440819066961920
15	59553569091796875000
16	2822351843277561397248

[1,3,24,270,3840,65625,1306368,29647548,754974720, 21308126895,660000000000,22254310307658, 811365140791296,31801886192186565, 1333440819066961920,59553569091796875000, 2822351843277561397248]