a(n) = (4*n+1)*(2^(4*n+1)+(-1)^n*2^(2*n+1)+1).
A202628
a(n) = (4*n+1)*(2^(4*n+1)+(-1)^n*2^(2*n+1)+1).
Terms
- a(0) =5a(1) =125a(2) =4905a(3) =104845a(4) =2236945a(5) =43997205a(6) =839065625a(7) =15568306205a(8) =283472166945
External references
- oeis: A202628