a(n) = (n!)^2 - 1.A046032a(n) = (n!)^2 - 1.Terms a(0) =0a(1) =3a(2) =35a(3) =575a(4) =14399a(5) =518399a(6) =25401599a(7) =1625702399a(8) =131681894399External referencesoeis: A046032