sech(tan(sin(x)))=1-1/2!*x^2+1/4!*x^4+47/6!*x^6-447/8!*x^8...

A012149

sech(tan(sin(x)))=1-1/2!*x^2+1/4!*x^4+47/6!*x^6-447/8!*x^8...

Terms

    a(0) =1a(1) =-1a(2) =1a(3) =47a(4) =-447a(5) =-31649a(6) =1241153a(7) =94750991a(8) =-10593064063a(9) =-734072274241

External references