cos(tanh(x)+tan(x))=1-4/2!*x^2+16/4!*x^4-448/6!*x^6+14592/8!*x^8...

A013138

cos(tanh(x)+tan(x))=1-4/2!*x^2+16/4!*x^4-448/6!*x^6+14592/8!*x^8...

Terms

    a(0) =1a(1) =-4a(2) =16a(3) =-448a(4) =14592a(5) =-705536a(6) =65245184a(7) =-5385535488a(8) =910402060288

External references