A348816 - OEIS

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A348816 as a simple table

n	a(n)
1	0
2	1
3	15
4	4790
5	4151415
6	6619291247
7	17510518983528
8	71631394311300461
9	429426878302882412435
10	3616596939726424941979785

[0,1,15,4790,4151415,6619291247,17510518983528, 71631394311300461,429426878302882412435, 3616596939726424941979785]