264860domain: NAppears in sequencesG.f. L(x,y) satisfies: L(x,y) = x * (1 + y*x*L'(x,y)) / (1 + x*L'(x,y)) where L'(x,y) = d/dx L(x,y), as a triangle read by rows.at n=29A301305a(n) = (1/(n+1)) * Sum_{k=0..n} k^2 * (k+1) * binomial(2*n-k,n-k).at n=10A390965Expansion of 1 / ((1-x)^3 - x^4)^2.at n=15A392587