A221399 - OEIS

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A221399 as a simple table

n	a(n)
1	0
2	324
3	26374
4	2294372
5	197166544
6	16996641648
7	1467880996172
8	126930182790936
9	10983593507924760
10	950783861987061762
11	82317652792534321058
12	7127444249953921537462

[0,324,26374,2294372,197166544,16996641648, 1467880996172,126930182790936,10983593507924760, 950783861987061762,82317652792534321058, 7127444249953921537462]