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v[1] = 1; v[2] = 3 + 4*x; for(n = 2, N, my(i = n + 1); v[i] = (-(8 - (4*n - 40)*x - (14*n - 75)*x^2 - (18*n - 66)*x^3 - (10*n - 27)*x^4 - (2*n - 4)*x^5)*v[i - 2] - (4*x + 18*x^2 + 32*x^3 + 28*x^4 + 12*x^5 + 2*x^6)*deriv(v[i - 2], x) + (6 - (2*n - 20)*x - (6*n - 24)*x^2 - (6*n - 12)*x^3 - (2*n - 2)*x^4)*v[i - 1] + (2*x + 8*x^2 + 12*x^3 + 8*x^4 + 2*x^5)*deriv(v[i - 1], x))/(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-a7e9ebb9860a9dbe","steps":["D+1","x \u21a6 x/(x+1)"],"edges":["e-9fe96d700c9448ac","e-9a77ada7db91123e"],"text":"A075497 \u2192 D+1 \u2192 x \u21a6 x/(x+1)"},"headline":"A075497 \u2192 D+1 \u2192 x \u21a6 x/(x+1)","chain":null}