In my example table, in my reply to Alois, I wrote the g.f. as F_k(x)=(1-3*k*x+k^2*x^2)/(1-x-4*k*x+3*k*x^2+3*k^2*x^3-k^2*x^4), when it should have been F_k(x)=(1-3*k*x+k^2*x^2)/(1-x-4*k*x^2+3*k*x^3+3*k^2*x^4-k^2*x^5). Ed