A280904 - OEIS

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A280904 as a simple table

n	a(n)
1	0
2	9
3	646
4	22568
5	492490
6	9426050
7	162640161
8	2636238543
9	40818734359
10	610807332682
11	8899797476985
12	126936297853576
13	1779063560531884
14	24572630681534366
15	335222285940398228
16	4524762545977409290

[0,9,646,22568,492490,9426050,162640161, 2636238543,40818734359,610807332682,8899797476985, 126936297853576,1779063560531884, 24572630681534366,335222285940398228, 4524762545977409290]