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v[1] = 1; v[2] = 5 + 4*x; v[3] = 18 + 26*x + 9*x^2; for(n = 3, N, my(i = n + 1); v[i] = (8 + 12*x + 6*x^2 + x^3)*v[i - 3] - (12 + 12*x + 3*x^2)*v[i - 2] + (6 + 3*x)*v[i - 1]); 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-c8c19eba9d68881f","steps":["(\u03b8+1)\u00b2","x \u21a6 x+1"],"edges":["e-6f35c326bbf0f62d","e-c354d1860a6cfc2f"],"text":"A007318 \u2192 (\u03b8+1)\u00b2 \u2192 x \u21a6 x+1"},"headline":"A007318 \u2192 (\u03b8+1)\u00b2 \u2192 x \u21a6 x+1","chain":null}