a(n) = 5^(2*n)*(5^(2*n)-1)*Bernoulli(2*n)/(2*n).
A047683
a(n) = 5^(2*n)*(5^(2*n)-1)*Bernoulli(2*n)/(2*n).
Terms
- a(0) =50a(1) =-3250a(2) =968750a(3) =-635781250a(4) =722480468750
External references
- oeis: A047683
A047683
a(n) = 5^(2*n)*(5^(2*n)-1)*Bernoulli(2*n)/(2*n).