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v[1] = 1; for(n = 2, N, my(i = n); v[i] = ((3 - (4*n - 15)*x - (8*n - 20)*x^2 - (4*n - 8)*x^3)*v[i - 1] + (4*x + 12*x^2 + 12*x^3 + 4*x^4)*deriv(v[i - 1], x))/(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-7d6d6baad7692ddc","steps":["x \u21a6 x/(x+1)"],"edges":["e-54f149d87a232a74"],"text":"A225469 \u2192 x \u21a6 x/(x+1)"},"headline":"A225469 \u2192 x \u21a6 x/(x+1)","chain":null}