A083484 - OEIS

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A083484 as a simple table

n	a(n)
1	1
2	4
3	12
4	60
5	420
6	2520
7	27720
8	720720
9	720720
10	24504480
11	465585120
12	2793510720
13	64250746560
14	642507465600
15	1927522396800
16	111796299014400
17	3465685269446400
18	20794111616678400
19	727793906583744000

[1,4,12,60,420,2520,27720,720720,720720,24504480, 465585120,2793510720,64250746560,642507465600, 1927522396800,111796299014400,3465685269446400, 20794111616678400,727793906583744000]