cos(arctanh(x)*cos(x))=1-1/2!*x^2+5/4!*x^4-85/6!*x^6-887/8!*x^8...

A012743

cos(arctanh(x)*cos(x))=1-1/2!*x^2+5/4!*x^4-85/6!*x^6-887/8!*x^8...

Terms

    a(0) =1a(1) =-1a(2) =5a(3) =-85a(4) =-887a(5) =-145865a(6) =-14963507a(7) =-2554796829a(8) =-556819358703

External references