tan(cos(x)-sech(x))=-4/4!*x^4+60/6!*x^6-1384/8!*x^8+50520/10!*x^10...

A013485

tan(cos(x)-sech(x))=-4/4!*x^4+60/6!*x^6-1384/8!*x^8+50520/10!*x^10...

Terms

    a(0) =-4a(1) =60a(2) =-1384a(3) =50520a(4) =-3441964a(5) =401162580a(6) =-63557233744

External references