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v[1] = 1; v[2] = 4 + 7*x; for(n = 2, N, my(i = n + 1); v[i] = ((29*n^2 - 77*n + 48 + (200*n^2 - 562*n + 362)*x + (576*n^2 - 1680*n + 1104)*x^2 + (884*n^2 - 2636*n + 1752)*x^3 + (761*n^2 - 2293*n + 1532)*x^4 + (348*n^2 - 1050*n + 702)*x^5 + (66*n^2 - 198*n + 132)*x^6)*v[i - 1] - (39*n - 76 + (334*n - 660)*x + (1213*n - 2420)*x^2 + (2424*n - 4864)*x^3 + (2881*n - 5796)*x^4 + (2038*n - 4100)*x^5 + (795*n - 1596)*x^6 + (132*n - 264)*x^7)*deriv(v[i - 1], x) + (13 + 133*x + 587*x^2 + 1461*x^3 + 2245*x^4 + 2183*x^5 + 1313*x^6 + 447*x^7 + 66*x^8)*deriv(deriv(v[i - 1], x), x))/(2*n - 2 + (6*n - 6)*x + (6*n - 6)*x^2 + (2*n - 2)*x^3)); 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-e7331b0d50084c15","steps":["basis A007318","x \u21a6 x/(x+1)"],"edges":["e-212843e2c5c5a487","e-35dcb6fff08d7919"],"text":"A249251 \u2192 basis A007318 \u2192 x \u21a6 x/(x+1)"},"headline":"A249251 \u2192 basis A007318 \u2192 x \u21a6 x/(x+1)","chain":null}