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v[1] = 1; v[2] = -6 + x; for(n = 2, N, my(i = n + 1); v[i] = -(6 - x)*v[i - 1] - (12 - 2*x)*v[i - 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-ba196dcd01800741","steps":["x \u21a6 x\u22126"],"edges":["e-4867241b67312c9e"],"text":"A113953 \u2192 x \u21a6 x\u22126"},"headline":"A113953 \u2192 x \u21a6 x\u22126","chain":null}