A132511 - OEIS

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A132511 as a simple table

n	a(n)
1	4
2	20
3	519
4	2143067
5	18287805708761
6	18106009499053689257383057825
7	700601920425487669158589840746065001284609234708224745400

[4,20,519,2143067,18287805708761, 18106009499053689257383057825, 70060192042548766915858984074606500128460923470822\ 4745400]