A307038 - OEIS

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A307038 as a simple table

n	a(n)
1	1
2	20
3	272
4	65792
5	2901600
6	4596800
7	29016000
8	4295032832
9	5789534400
10	49085337600
11	585248256000
12	960935040000

[1,20,272,65792,2901600,4596800,29016000, 4295032832,5789534400,49085337600,585248256000, 960935040000]