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x.","mathematica":"P[1, x_] := 1 + x;\nP[n_, x_] := P[n, x] = Expand[(2 + 5*x + 4*x^2 + x^3)*P[n - 1, x]];\nTable[CoefficientList[P[n, x], x], {n, 1, 10}] // Flatten","pari":"P(N) = {my(v = vector(N)); v[1] = 1 + x; for(n = 2, N, my(i = n); v[i] = (2 + 5*x + 4*x^2 + x^3)*v[i - 1]); v};\nrow(n, p) = {my(c = Vecrev(p)); c};\nT(N) = {my(v = P(N)); concat(vector(#v, i, row(i, v[i])))};\nT(10)","reading":{"first_row":1,"offset":1,"reversed":false,"trim_zeros":"none","regular_triangle":false}}],"derivation":{"root":"n-07e2f0a7469aac14","steps":["x \u21a6 x+1"],"edges":["e-247c19f1e460b924"],"text":"Veronese parent of A098172 \u2192 x \u21a6 x+1"},"headline":"Veronese parent of A098172 \u2192 x \u21a6 x+1","chain":null}