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1225 + 1260*x + 324*x^2.","mathematica":"P[0, x_] := 1225 + 1260*x + 324*x^2;\nP[n_, x_] := P[n, x] = Expand[(35 + 18*x)*P[n - 1, x]];\nTable[CoefficientList[P[n, x], x], {n, 0, 9}] // Flatten","pari":"P(N) = {my(v = vector(N + 1)); v[1] = 1225 + 1260*x + 324*x^2; for(n = 1, N, my(i = n + 1); v[i] = (35 + 18*x)*v[i - 1]); 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-1f2dec04776afb2b","steps":["basis A013610","x \u21a6 x+1"],"edges":["e-572c9115d911d6cf","e-8feb932440ae1fbc"],"text":"A038320 \u2192 basis A013610 \u2192 x \u21a6 x+1"},"headline":"A038320 \u2192 basis A013610 \u2192 x \u21a6 x+1","chain":null}