A071248 - OEIS

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A071248 as a simple table

n	a(n)
1	1
2	4
3	54
4	768
5	75000
6	466560
7	592950960
8	5284823040
9	1735643790720
10	45360000000000
11	1035338990313196800
12	102980960177356800
13	145077660657859734604800
14	154452450072526199193600

[1,4,54,768,75000,466560,592950960,5284823040, 1735643790720,45360000000000,1035338990313196800, 102980960177356800,145077660657859734604800, 154452450072526199193600]