A080975 - OEIS

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A080975 as a simple table

n	a(n)
0	1
1	7
2	515
3	73211
4	2249220471
5	431283926958
6	18838905762720934
7	896134321804401371660
8	2333852111980919691995847581921
9	537961368577436933017494169487235

[1,7,515,73211,2249220471,431283926958, 18838905762720934,896134321804401371660, 2333852111980919691995847581921, 537961368577436933017494169487235]