A055355 - OEIS

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A055355 as a simple table

n	a(n)
9	45360
10	9862560
11	1160973000
12	99904860000
13	7103580541200
14	445556635524000
15	25652184715357200
16	1391455702596960000
17	72404516222438400000
18	3661224054771419136000
19	181631020686490222848000

[45360,9862560,1160973000,99904860000, 7103580541200,445556635524000,25652184715357200, 1391455702596960000,72404516222438400000, 3661224054771419136000,181631020686490222848000]