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v[1] = 1; v[2] = 1 + 2*x; for(n = 2, N, my(i = n + 1); v[i] = (-(n^2 - 4*n + 4 + (4*n^2 - 14*n + 12)*x + (6*n^2 - 18*n + 13)*x^2 + (4*n^2 - 10*n + 6)*x^3 + (n^2 - 2*n + 1)*x^4)*v[i - 2] + (2*n - 3 + (6*n - 7)*x + (6*n - 5)*x^2 + (2*n - 1)*x^3)*v[i - 1])/(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 - 1, v[i])))};\nT(9)","reading":{"first_row":0,"offset":0,"reversed":false,"trim_zeros":"none","regular_triangle":false}}],"derivation":{"root":"n-b9fbfb57d9269e2f","steps":["D+1","x \u21a6 x/(x+1)"],"edges":["e-649ce40fa3feb4c2","e-d61666c9a8af3460"],"text":"A132393 \u2192 D+1 \u2192 x \u21a6 x/(x+1)"},"headline":"A132393 \u2192 D+1 \u2192 x \u21a6 x/(x+1)","chain":null}