cosh(arcsin(arctan(x)))=1+1/2!*x^2-3/4!*x^4+69/6!*x^6-2503/8!*x^8...

A012096

cosh(arcsin(arctan(x)))=1+1/2!*x^2-3/4!*x^4+69/6!*x^6-2503/8!*x^8...

Terms

    a(0) =1a(1) =1a(2) =-3a(3) =69a(4) =-2503a(5) =177481a(6) =-18539595a(7) =2813939725a(8) =-573509386895

External references