A015497 - OEIS

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A015497 as a simple table

n	a(n)
0	1
1	9
2	82
3	6724
4	4908520
5	32209708240
6	1901983271572000
7	1010793793810766824000
8	4834596391983083396187280000
9	208113526867898819658489702096160000
10	80627444554789525982513713046048334318400000

[1,9,82,6724,4908520,32209708240,1901983271572000, 1010793793810766824000, 4834596391983083396187280000, 208113526867898819658489702096160000, 80627444554789525982513713046048334318400000]