A000817 - OEIS

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A000817 as a simple table

n	a(n)
1	16
2	80
3	1056
4	320416
5	1858620869536
6	16880173675357998942609488800
7	706695723125809149019144715477884710572926078237246360174451424

[16,80,1056,320416,1858620869536, 16880173675357998942609488800, 70669572312580914901914471547788471057292607823724\ 6360174451424]