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v[1] = 1; v[2] = 4 + 7*x; for(n = 2, N, my(i = n + 1); v[i] = ((27*n^2 - 68*n + 41 + (180*n^2 - 479*n + 299)*x + (500*n^2 - 1387*n + 887)*x^2 + (740*n^2 - 2117*n + 1377)*x^3 + (615*n^2 - 1799*n + 1184)*x^4 + (272*n^2 - 808*n + 536)*x^5 + (50*n^2 - 150*n + 100)*x^6)*v[i - 1] - (36*n - 66 + (300*n - 561)*x + (1059*n - 2014)*x^2 + (2056*n - 3966)*x^3 + (2374*n - 4634)*x^4 + (1632*n - 3217)*x^5 + (619*n - 1230)*x^6 + (100*n - 200)*x^7)*deriv(v[i - 1], x) + (12 + 120*x + 517*x^2 + 1255*x^3 + 1880*x^4 + 1782*x^5 + 1045*x^6 + 347*x^7 + 50*x^8)*deriv(deriv(v[i - 1], x), x))/(n - 1 + (3*n - 3)*x + (3*n - 3)*x^2 + (n - 1)*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-eac80c2bf8e566f5","steps":["x \u21a6 x+1","x \u21a6 x/(x+1)"],"edges":["e-237035d3e801d2dc","e-30f5d5c1e85b1a97"],"text":"A249250 \u2192 x \u21a6 x+1 \u2192 x \u21a6 x/(x+1)"},"headline":"A249250 \u2192 x \u21a6 x+1 \u2192 x \u21a6 x/(x+1)","chain":null}
