a(n)=(-1)^(n+1)*(5/4)*(25^n-1)*B(2n) where B(k) denotes the k-th Bernoulli number.
A090644
a(n)=(-1)^(n+1)*(5/4)*(25^n-1)*B(2n) where B(k) denotes the k-th Bernoulli number.
Terms
- a(0) =0a(1) =5a(2) =26a(3) =465a(4) =16276a(5) =924775a(6) =77244126a(7) =8900960285
External references
- oeis: A090644