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64*x^2.","mathematica":"P[0, x_] := 400 + 384*x + 64*x^2;\nP[n_, x_] := P[n, x] = Expand[(20 + 8*x)*P[n - 1, x] + 8*x*D[P[n - 1, x], x]];\nTable[CoefficientList[P[n, x], x], {n, 0, 9}] // Flatten","pari":"P(N) = {my(v = vector(N + 1)); v[1] = 400 + 384*x + 64*x^2; for(n = 1, N, my(i = n + 1); v[i] = (20 + 8*x)*v[i - 1] + 8*x*deriv(v[i - 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-6874f381e9c7e0a2","steps":["basis A008277"],"edges":["e-cdf5d4e7a8154a31"],"text":"A038334 \u2192 basis A008277"},"headline":"A038334 \u2192 basis A008277","chain":null}