a(n) = 4^(2*n)*(4^(2*n)-1)*Bernoulli(2*n)/(2*n).
A047682
a(n) = 4^(2*n)*(4^(2*n)-1)*Bernoulli(2*n)/(2*n).
Terms
- a(0) =20a(1) =-544a(2) =66560a(3) =-17895424a(4) =8329625600
External references
- oeis: A047682
A047682
a(n) = 4^(2*n)*(4^(2*n)-1)*Bernoulli(2*n)/(2*n).