A173790 - OEIS

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A173790 as a simple table

n	a(n)
1	0
2	20
3	10920
4	20790000
5	103255152000
6	1114503570180000
7	23066862702843960000
8	836044438958485716960000
9	49543884378171403300080000000
10	4549287429148856071620622680000000

[0,20,10920,20790000,103255152000, 1114503570180000,23066862702843960000, 836044438958485716960000, 49543884378171403300080000000, 4549287429148856071620622680000000]