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v[1] = 1; for(n = 1, N, my(i = n + 1); v[i] = ((4*n + (23*n - 5)*x + (42*n - 18)*x^2 + (31*n - 21)*x^3 + (8*n - 8)*x^4)*v[i - 1] - (2*x + 14*x^2 + 30*x^3 + 26*x^4 + 8*x^5)*deriv(v[i - 1], x))/(n + 2*n*x + 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-2245b35ec7cd4857","steps":["basis A013610","x \u21a6 x/(x+1)"],"edges":["e-0cc36dd83eba3acf","e-9492ae8c8e3387e9"],"text":"A091044 \u2192 basis A013610 \u2192 x \u21a6 x/(x+1)"},"headline":"A091044 \u2192 basis A013610 \u2192 x \u21a6 x/(x+1)","chain":null}