tanh(log(cos(x)))=-1/2!*x^2-2/4!*x^4+14/6!*x^6+568/8!*x^8...

A012005

tanh(log(cos(x)))=-1/2!*x^2-2/4!*x^4+14/6!*x^6+568/8!*x^8...

Terms

    a(0) =-1a(1) =-2a(2) =14a(3) =568a(4) =9704a(5) =-229712a(6) =-35581456a(7) =-1790014592a(8) =72312646784

External references