A012139 - OEIS

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A012139 as a simple table

n	a(n)
0	1
1	4
2	84
3	4208
4	386064
5	56523072
6	12121690944
7	3589856932608
8	1406019035808000
9	704535958463063040
10	439949357001315947520
11	335139715537167259791360
12	305989012726577998256148480

[1,4,84,4208,386064,56523072,12121690944, 3589856932608,1406019035808000,704535958463063040, 439949357001315947520,335139715537167259791360, 305989012726577998256148480]