A101613 - OEIS

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A101613 as a simple table

n	a(n)
1	3
2	26
3	684
4	35664
5	3068640
6	392722560
7	69878833920
8	16484477184000
9	4976250951168000
10	1870345490614272000
11	856314330237628416000
12	469109144339151224832000
13	302956190548293037916160000

[3,26,684,35664,3068640,392722560,69878833920, 16484477184000,4976250951168000, 1870345490614272000,856314330237628416000, 469109144339151224832000, 302956190548293037916160000]