a(n) = ((2n)^(2n) - 1)/((2n+1)*(2n-1)).
A128542
a(n) = ((2n)^(2n) - 1)/((2n+1)*(2n-1)).
Terms
- a(0) =0a(1) =1a(2) =17a(3) =1333a(4) =266305a(5) =101010101a(6) =62350352785
External references
- oeis: A128542
A128542
a(n) = ((2n)^(2n) - 1)/((2n+1)*(2n-1)).