a(n) = Numerator((-1)^n*Euler(2*n)*(2*n+1)/(4^(2*n+1)-2^(2*n+1))), where Euler(n) = A122045(n).
A160143
a(n) = Numerator((-1)^n*Euler(2*n)*(2*n+1)/(4^(2*n+1)-2^(2*n+1))), where Euler(n) = A122045(n).
Terms
- a(0) =1a(1) =3a(2) =25a(3) =427a(4) =12465a(5) =555731a(6) =35135945a(7) =2990414715a(8) =329655706465
External references
- oeis: A160143