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36)*x + (15*n - 27)*x^2 + 6*x^3)*P[n - 1, x] + ((3*n - 6)*x - (3*n - 12)*x^2 - 6*x^3)*D[P[n - 1, x], x])/(n - 2 + 2*x)]];\nTable[CoefficientList[P[n, x], x], {n, 0, 9}] // Flatten","pari":"P(N) = {my(v = vector(N + 1)); v[1] = 1; v[2] = 6 + 3*x; for(n = 2, N, my(i = n + 1); v[i] = (-(18*n - 18 + (18*n^2 - 63*n + 81)*x + (9*n^3 - 45*n^2 + 108*n - 126)*x^2 + (27*n^2 - 90*n + 81)*x^3 + (18*n - 18)*x^4)*v[i - 2] - ((9*n - 9)*x + (9*n^2 - 36*n + 45)*x^2 - (9*n^2 - 54*n + 81)*x^3 - (27*n - 63)*x^4 - 18*x^5)*deriv(v[i - 2], x) + (9*n - 15 + (6*n^2 - 21*n + 36)*x + (15*n - 27)*x^2 + 6*x^3)*v[i - 1] + ((3*n - 6)*x - (3*n - 12)*x^2 - 6*x^3)*deriv(v[i - 1], x))/(n - 2 + 2*x)); 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-dfedc6a36c97eba4","steps":["D+1"],"edges":["e-dd620007191fbf7f"],"text":"A257620 \u2192 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