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v[1] = 11 + 36*x + 29*x^2; for(n = 1, N, my(i = n + 1); v[i] = (-(2*n - 1 + (18*n + 7)*x + (46*n + 33)*x^2 + (46*n + 41)*x^3 + (16*n + 16)*x^4)*v[i - 1] + (6 + 38*x + 94*x^2 + 114*x^3 + 68*x^4 + 16*x^5)*deriv(v[i - 1], x))/(2*n + 3 + (4*n + 6)*x + (2*n + 3)*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-8eb9bb3a09f0b7fd","steps":["basis A007318","x \u21a6 x/(x+1)"],"edges":["e-1acefd6886502727","e-521176253b4569dc"],"text":"A123519 \u2192 basis A007318 \u2192 x \u21a6 x/(x+1)"},"headline":"A123519 \u2192 basis A007318 \u2192 x \u21a6 x/(x+1)","chain":null}