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v[1] = 1; for(n = 2, N, my(i = n); v[i] = (-(2*n - 5 + (11*n - 26)*x + (22*n - 49)*x^2 + (19*n - 40)*x^3 + (6*n - 12)*x^4)*v[i - 1] + (2 + 13*x + 33*x^2 + 41*x^3 + 25*x^4 + 6*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, v[i])))};\nT(10)","reading":{"first_row":1,"offset":1,"reversed":false,"trim_zeros":"none","regular_triangle":false}}],"derivation":{"root":"n-2cabfd060b04f15d","steps":["x \u21a6 x+1","x \u21a6 x/(x+1)"],"edges":["e-10a26558e3d19067","e-d9029cb49d3066f9"],"text":"A131689 \u2192 x \u21a6 x+1 \u2192 x \u21a6 x/(x+1)"},"headline":"A131689 \u2192 x \u21a6 x+1 \u2192 x \u21a6 x/(x+1)","chain":null}