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41*x^2; for(n = 1, N, my(i = n + 1); v[i] = ((5 - (5*n - 6)*x - (10*n + 4)*x^2 - (5*n + 5)*x^3)*v[i - 1] + (5*x + 15*x^2 + 15*x^3 + 5*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-77f76afdd288bbc1","steps":["x \u21a6 x/(x+1)"],"edges":["e-a1488c1114be0089"],"text":"A075500 \u2192 x \u21a6 x/(x+1)"},"headline":"A075500 \u2192 x \u21a6 x/(x+1)","chain":null}