A066544 - OEIS

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A066544 as a simple table

n	a(n)
2	4
3	69360
4	25181448044544
5	500282053019322336000000000
6	1364205042837678184255639132540659302400000000
7	1119704625219101611411719462621416231171361585800882437615771859939328

[4,69360,25181448044544, 500282053019322336000000000, 1364205042837678184255639132540659302400000000, 11197046252191016114117194626214162311713615858008\ 82437615771859939328]