E.g.f. A(x)=sum{n>0, a(n)x^(2*n-1)/(2*n-1)!} satisfies A(A(x))=sin(2*x)/2.

A220113

E.g.f. A(x)=sum{n>0, a(n)x^(2*n-1)/(2*n-1)!} satisfies A(A(x))=sin(2*x)/2.

Terms

    a(0) =1a(1) =-2a(2) =-12a(3) =-424a(4) =-29808a(5) =-2966816a(6) =-237449920a(7) =76118167936

External references