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v[1] = 1; for(n = 1, N, my(i = n + 1); v[i] = ((21*n - 9 + (110*n - 58)*x + (196*n - 128)*x^2 + (146*n - 118)*x^3 + (39*n - 39)*x^4)*v[i - 1] - (5 + 43*x + 138*x^2 + 206*x^3 + 145*x^4 + 39*x^5)*deriv(v[i - 1], x))/(4*n + 8*n*x + 4*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-79ebafb266da3b41","steps":["basis A013609","x \u21a6 x/(x+1)"],"edges":["e-1a56a7670c2d3c41","e-03e28e6f1379bef5"],"text":"A172431 \u2192 basis A013609 \u2192 x \u21a6 x/(x+1)"},"headline":"A172431 \u2192 basis A013609 \u2192 x \u21a6 x/(x+1)","chain":null}