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v[1] = 1; v[2] = 2 + 3*x; for(n = 2, N, my(i = n + 1); v[i] = (-(n + (2*n^2 + 2*n)*x + (n^3 + 4*n^2 + n)*x^2 + (2*n^3 + 2*n^2)*x^3 + n^3*x^4)*v[i - 2] + (2*n - 1 + (2*n^2 + 4*n - 3)*x + (4*n^2 + 2*n - 3)*x^2 + (2*n^2 - 1)*x^3)*v[i - 1])/(n - 1 + (2*n - 2)*x + (n - 1)*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-4d60c3dd8627c01d","steps":["D+1","x \u21a6 x/(x+1)"],"edges":["e-55797f5beaf34466","e-a7c7d7602531be57"],"text":"A094638 \u2192 D+1 \u2192 x \u21a6 x/(x+1)"},"headline":"A094638 \u2192 D+1 \u2192 x \u21a6 x/(x+1)","chain":null}