sech(tan(x)+arcsin(x))=1-4/2!*x^2+56/4!*x^4-1894/6!*x^6+120872/8!*x^8...

A012959

sech(tan(x)+arcsin(x))=1-4/2!*x^2+56/4!*x^4-1894/6!*x^6+120872/8!*x^8...

Terms

    a(0) =1a(1) =-4a(2) =56a(3) =-1894a(4) =120872a(5) =-12371994a(6) =1856495604a(7) =-384431704934

External references