cos(arcsinh(x)*tan(x))=1-12/4!*x^4-120/6!*x^6-5040/8!*x^8...

A012615

cos(arcsinh(x)*tan(x))=1-12/4!*x^4-120/6!*x^6-5040/8!*x^8...

Terms

    a(0) =1a(1) =0a(2) =-12a(3) =-120a(4) =-5040a(5) =-35520a(6) =-10080576a(7) =1291774848a(8) =-129155669760

External references