cos(tan(x)-arctanh(x))=1-8064/10!*x^10-2838528/12!*x^12...

A013458

cos(tan(x)-arctanh(x))=1-8064/10!*x^10-2838528/12!*x^12...

Terms

    a(0) =1a(1) =0a(2) =0a(3) =0a(4) =0a(5) =-8064a(6) =-2838528a(7) =-863070208a(8) =-280413765632

External references