a(n)=(-1)^(n+1)*2*(16^n-1)*B(2n) where B(k) denotes the k-th Bernoulli number.

A090645

a(n)=(-1)^(n+1)*2*(16^n-1)*B(2n) where B(k) denotes the k-th Bernoulli number.

Terms

    a(0) =0a(1) =5a(2) =17a(3) =195a(4) =4369a(5) =158875a(6) =8493081a(7) =626349395a(8) =60921163553

External references