A169620 - OEIS

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A169620 as a simple table

n	a(n)
0	1
1	5
2	1500
3	74250000
4	1176120000000000
5	9780613920000000000000000
6	63441756579801600000000000000000000000
7	446492348463430358369280000000000000000000000000000000

[1,5,1500,74250000,1176120000000000, 9780613920000000000000000, 63441756579801600000000000000000000000, 44649234846343035836928000000000000000000000000000\ 0000]