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v[1] = 1; v[2] = 5 + 8*x; v[3] = 18 + 57*x + 45*x^2; for(n = 3, N, my(i = n + 1); v[i] = ((8 + 60*x + 186*x^2 + 305*x^3 + 279*x^4 + 135*x^5 + 27*x^6)*v[i - 3] - (12 + 72*x + 171*x^2 + 201*x^3 + 117*x^4 + 27*x^5)*v[i - 2] + (6 + 27*x + 45*x^2 + 33*x^3 + 9*x^4)*v[i - 1])/(1 + 3*x + 3*x^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-787407680a56b31c","steps":["basis A007318","x \u21a6 x/(x+1)"],"edges":["e-70e46ddc2d19c133","e-567ecf0263f0f647"],"text":"A124932 \u2192 basis A007318 \u2192 x \u21a6 x/(x+1)"},"headline":"A124932 \u2192 basis A007318 \u2192 x \u21a6 x/(x+1)","chain":null}