A270508 - OEIS

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A270508 as a simple table

n	a(n)
1	0
2	90
3	40392
4	65046258
5	448630205184
6	14156156843376732
7	2109167396478578514420
8	1510530585264765595630150668

[0,90,40392,65046258,448630205184, 14156156843376732,2109167396478578514420, 1510530585264765595630150668]