A334519 - OEIS

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A334519 as a simple table

n	a(n)
1	1
2	2
3	8
4	6
5	84
6	5904
7	24
8	1632
9	1064304
10	2456909824
11	120
12	51040
13	402671760
14	15584878111040
15	2179875344187129600
16	720
17	2340480
18	273315542400
19	217353588326290944
20	823110394280028294344640

[1,2,8,6,84,5904,24,1632,1064304,2456909824,120, 51040,402671760,15584878111040, 2179875344187129600,720,2340480,273315542400, 217353588326290944,823110394280028294344640]