tanh(cos(x)*arctan(x))=x-7/3!*x^3+165/5!*x^5-9931/7!*x^7...

A012504

tanh(cos(x)*arctan(x))=x-7/3!*x^3+165/5!*x^5-9931/7!*x^7...

Terms

    a(0) =1a(1) =-7a(2) =165a(3) =-9931a(4) =1037033a(5) =-167246319a(6) =38489315917

External references