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v[1] = 0; v[2] = 2; for(n = 2, N, my(i = n + 1); v[i] = (-(n^3 - 7*n^2 + 10*n - (6*n^2 - 18*n)*x + 8*n*x^2)*v[i - 1] + (n^2 - 3*n + (2*n^2 - 10*n)*x - 8*n*x^2)*deriv(v[i - 1], x))/(n^2 - 3*n + 2 - (4*n - 4)*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-f6268da8d9636534","steps":["basis A013609","D"],"edges":["e-8afcaf02015990bf","e-ad23021f30ef02ea"],"text":"A122848 \u2192 basis A013609 \u2192 D"},"headline":"A122848 \u2192 basis A013609 \u2192 D","chain":null}