747496

Appears in sequences

• a(n) = a(n-1)+a(n-2)+a(n-3)+(8*n^3-48*n^2+112*n-96)/3 with a(0)=0, a(1)=0 and a(2)=1.at n=17A180670
• Discriminants of real quadratic fields with 3-class tower group <81,7>.at n=22A269321