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x)]];\nTable[CoefficientList[P[n, x], x], {n, 0, 9}] // Flatten","pari":"P(N) = {my(v = vector(N + 1)); v[1] = 289 + 748*x + 484*x^2; for(n = 1, N, my(i = n + 1); v[i] = ((17 + 39*x + 22*x^2)*v[i - 1])/(1 + 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-a5302200d285579d","steps":["x \u21a6 x+1","x \u21a6 x/(x+1)"],"edges":["e-bdf366c5a3f3b64d","e-6efd9ad05ded926d"],"text":"A038331 \u2192 x \u21a6 x+1 \u2192 x \u21a6 x/(x+1)"},"headline":"A038331 \u2192 x \u21a6 x+1 \u2192 x \u21a6 x/(x+1)","chain":null}