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

A185751

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

Terms

    a(0) =1a(1) =2a(2) =12a(3) =130a(4) =2070a(5) =43771a(6) =1157226a(7) =36768138a(8) =1365331392a(9) =58043143939

External references