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v[1] = 1; for(n = 1, N, my(i = n + 1); v[i] = ((3 - (3*n - 10)*x - (6*n - 10)*x^2 - (3*n - 3)*x^3)*v[i - 1] + (3*x + 9*x^2 + 9*x^3 + 3*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 - 1, v[i])))};\nT(9)","reading":{"first_row":0,"offset":0,"reversed":false,"trim_zeros":"none","regular_triangle":false}}],"derivation":{"root":"n-181be2f2eb86cd8e","steps":["x \u21a6 x/(x+1)"],"edges":["e-b41494f364d1716a"],"text":"A075498 \u2192 x \u21a6 x/(x+1)"},"headline":"A075498 \u2192 x \u21a6 x/(x+1)","chain":null}