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v[1] = 1; for(n = 1, N, my(i = n + 1); v[i] = (-(n - 5 + (9*n - 23)*x + (23*n - 39)*x^2 + (23*n - 29)*x^3 + (8*n - 8)*x^4)*v[i - 1] + (3 + 19*x + 47*x^2 + 57*x^3 + 34*x^4 + 8*x^5)*deriv(v[i - 1], x))/(n + 2*n*x + n*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-f287bed89e07609f","steps":["basis A013609","x \u21a6 x/(x+1)"],"edges":["e-7797a63e71923f20","e-d8c30bc07a26f83c"],"text":"A125662 \u2192 basis A013609 \u2192 x \u21a6 x/(x+1)"},"headline":"A125662 \u2192 basis A013609 \u2192 x \u21a6 x/(x+1)","chain":null}