a(n) = n^n - (n-2)^n.

A262067

a(n) = n^n - (n-2)^n.

Terms

    a(0) =2a(1) =4a(2) =26a(3) =240a(4) =2882a(5) =42560a(6) =745418a(7) =15097600a(8) =347066882a(9) =8926258176a(10) =253930611002

External references