a(n) = (2*n+1)^n-(2*n-1)^n-(2*n)^n.
A127691
a(n) = (2*n+1)^n-(2*n-1)^n-(2*n)^n.
Terms
- a(0) =-1a(1) =0a(2) =0a(3) =2a(4) =64a(5) =2002a(6) =69264a(7) =2697354a(8) =117899520a(9) =5740530914a(10) =308814720400
External references
- oeis: A127691
A127691
a(n) = (2*n+1)^n-(2*n-1)^n-(2*n)^n.