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v[1] = 1; v[2] = 2 + x; for(n = 3, N, my(i = n); v[i] = (x + 2*x^2 + x^3)*v[i - 2] + (2 + 7*x + 9*x^2 + 5*x^3 + x^4)*deriv(v[i - 2], x) + (3 + x - x^2)*v[i - 1] + (2 + 3*x + x^2)*deriv(v[i - 1], x)); 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","D+1"],"edges":["e-10a26558e3d19067","e-3f396c8e0bb8dccb"],"text":"A131689 \u2192 x \u21a6 x+1 \u2192 D+1"},"headline":"A131689 \u2192 x \u21a6 x+1 \u2192 D+1","chain":null}