A203683 - OEIS

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A203683 as a simple table

n	a(n)
1	1
2	5
3	1700
4	601120000
5	3496121614336000000
6	5335507266769461885009920000000000
7	34161019296423817239835748940949012820787200000000000000

[1,5,1700,601120000,3496121614336000000, 5335507266769461885009920000000000, 34161019296423817239835748940949012820787200000000\ 000000]