a(n) = 2^(2*n-2) * (2^(2*n-1)-1) * numerator(|Bernoulli(4*n)|/n).

A047680

a(n) = 2^(2*n-2) * (2^(2*n-1)-1) * numerator(|Bernoulli(4*n)|/n).

Terms

    a(0) =1a(1) =28a(2) =342736a(3) =29398976a(4) =22841912576

External references