A134646 - OEIS

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A134646 as a simple table

n	a(n)
1	0
2	2
3	31
4	1344
5	111920
6	16214000
7	3758757240
8	1310799454720
9	655551508577280
10	452647176631372800
11	418399785559398720000
12	504669505260741099417600
13	777461035821119354357452800
14	1501959201213688265322501427200

[0,2,31,1344,111920,16214000,3758757240, 1310799454720,655551508577280,452647176631372800, 418399785559398720000,504669505260741099417600, 777461035821119354357452800, 1501959201213688265322501427200]