A046857 - OEIS

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A046857 as a simple table

n	a(n)
1	2
2	6
3	1120
4	36324288000
5	18272974787062050706056806400000
6	244766458691906180755079840538505942906762183978675139272380197483053056000000000000

[2,6,1120,36324288000, 18272974787062050706056806400000, 24476645869190618075507984053850594290676218397867\ 5139272380197483053056000000000000]