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v[1] = 1; for(n = 1, N, my(i = n + 1); v[i] = ((3*n + (14*n - 3)*x + (23*n - 10)*x^2 + (16*n - 11)*x^3 + (4*n - 4)*x^4)*v[i - 1] - (1 + 7*x + 19*x^2 + 25*x^3 + 16*x^4 + 4*x^5)*deriv(v[i - 1], x))/(1 + 2*x + x^2)); v};\nrow(n, p) = {my(c = Vecrev(p)); c};\nT(N) = {my(v = P(N)); concat(vector(#v, i, row(i - 1, v[i])))};\nT(9)","reading":{"first_row":0,"offset":0,"reversed":false,"trim_zeros":"none","regular_triangle":false}}],"derivation":{"root":"n-d55979c30b97975a","steps":["x \u21a6 x+1","x \u21a6 x/(x+1)"],"edges":["e-be016f00370af8fd","e-d90f709ebfa06826"],"text":"A089231 \u2192 x \u21a6 x+1 \u2192 x \u21a6 x/(x+1)"},"headline":"A089231 \u2192 x \u21a6 x+1 \u2192 x \u21a6 x/(x+1)","chain":null}