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44*x^3 + 13*x^4)*P[n - 1, x])/(1 + 2*x + x^2)]];\nTable[CoefficientList[P[n, x], x], {n, 0, 9}] // Flatten","pari":"P(N) = {my(v = vector(N + 1)); v[1] = 1; for(n = 1, N, my(i = n + 1); v[i] = ((6 + 30*x + 55*x^2 + 44*x^3 + 13*x^4)*v[i - 1])/(1 + 2*x + 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-d3c3090977105807","steps":["x \u21a6 x+1","x \u21a6 x/(x+1)"],"edges":["e-33933faab90bc4be","e-5b6b2cc1b4672189"],"text":"A272867 \u2192 x \u21a6 x+1 \u2192 x \u21a6 x/(x+1)"},"headline":"A272867 \u2192 x \u21a6 x+1 \u2192 x \u21a6 x/(x+1)","chain":null}
