Expansion 1/(1-x^2*cotan(x)) = Sum_{n>=0} a(n)*x^n/(n)!^2.

A199540

Expansion 1/(1-x^2*cotan(x)) = Sum_{n>=0} a(n)*x^n/(n)!^2.

Terms

    a(0) =1a(1) =1a(2) =4a(3) =24a(4) =192a(5) =-320a(6) =-138240a(7) =-10214400a(8) =-669204480a(9) =-43782488064

External references