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v[1] = 1; v[2] = 2 + 2*x; v[3] = 7 + 10*x + 3*x^2; v[4] = 20 + 40*x + 24*x^2 + 4*x^3; for(n = 5, N, my(i = n); v[i] = -(1 + 2*x + x^2)*v[i - 4] - (4 + 6*x + 2*x^2)*v[i - 3] - (2 + 2*x + x^2)*v[i - 2] + (4 + 2*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, v[i])))};\nT(10)","reading":{"first_row":1,"offset":1,"reversed":false,"trim_zeros":"none","regular_triangle":false}}],"derivation":{"root":"n-b0fc620949fb5990","steps":["\u03b8+1","x \u21a6 x+1"],"edges":["e-55b0f4921ded9c14","e-667cd9b0715a689f"],"text":"A122542 \u2192 \u03b8+1 \u2192 x \u21a6 x+1"},"headline":"A122542 \u2192 \u03b8+1 \u2192 x \u21a6 x+1","chain":null}