a(n) equals the coefficient of x^(2n-1) in the (2n-1)-th iteration of x/(1-x^2) for n>=1.

A185752

a(n) equals the coefficient of x^(2n-1) in the (2n-1)-th iteration of x/(1-x^2) for n>=1.

Terms

    a(0) =1a(1) =3a(2) =35a(3) =763a(4) =24639a(5) =1057991a(6) =56776733a(7) =3658333743a(8) =275216215907

External references