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v[1] = 1; for(n = 1, N, my(i = n + 1); v[i] = ((13*n - 7 + (59*n - 37)*x + (97*n - 71)*x^2 + (69*n - 59)*x^3 + (18*n - 18)*x^4)*v[i - 1] - (5 + 34*x + 90*x^2 + 116*x^3 + 73*x^4 + 18*x^5)*deriv(v[i - 1], x))/(2*n + 4*n*x + 2*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 A007318","x \u21a6 x/(x+1)"],"edges":["e-1a8887aa0d003bc9","e-a51efd110ad12eac"],"text":"A172431 \u2192 basis A007318 \u2192 x \u21a6 x/(x+1)"},"headline":"A172431 \u2192 basis A007318 \u2192 x \u21a6 x/(x+1)","chain":null}