A175925 - OEIS

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A175925 as a simple table

n	a(n)
0	1
1	6
2	30
3	168
4	1080
5	7920
6	65520
7	604800
8	6168960
9	68947200
10	838252800
11	11017036800
12	155675520000
13	2353813862400
14	37922556672000
15	648606486528000
16	11737685127168000
17	224083079700480000
18	4500868715126784000

[1,6,30,168,1080,7920,65520,604800,6168960, 68947200,838252800,11017036800,155675520000, 2353813862400,37922556672000,648606486528000, 11737685127168000,224083079700480000, 4500868715126784000]