cosh(sec(x)*arcsinh(x))=1+1/2!*x^2+9/4!*x^4+225/6!*x^6+6993/8!*x^8...
A012831
cosh(sec(x)*arcsinh(x))=1+1/2!*x^2+9/4!*x^4+225/6!*x^6+6993/8!*x^8...
Terms
- a(0) =1a(1) =1a(2) =9a(3) =225a(4) =6993a(5) =467745a(6) =29529753a(7) =4297350785a(8) =378759492257
External references
- oeis: A012831