a(n)=(-36^n/18)*B(2n,1/6)/B(2n,1/3) where B(n,x) is the n-th Bernoulli polynomial.

A094938

a(n)=(-36^n/18)*B(2n,1/6)/B(2n,1/3) where B(n,x) is the n-th Bernoulli polynomial.

Terms

    a(0) =1a(1) =63a(2) =2511a(3) =92583a(4) =3352671a(5) =120873303a(6) =4353033231a(7) =156723545223

External references