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33330392578125,   6535371093750,    576650390625;\n  9: 34271896307633, 332638993574085, 1467524971650375, 3884624924956875, 6855220455806250, 8468213504231250, 7471953091968750, 4709214133593750, 2077594470703125, 611057197265625, 107833623046875, 8649755859375;\n","recurrence_sentence":"The row polynomials satisfy P(n,x) = (17+15*x)*P(n-1,x) for n >= 1, with P(0,x) = 289 + 510*x + 225*x^2.","mathematica":"P[0, x_] := 289 + 510*x + 225*x^2;\nP[n_, x_] := P[n, x] = Expand[(17 + 15*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] = 289 + 510*x + 225*x^2; for(n = 1, N, my(i = n + 1); v[i] = (17 + 15*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-a5302200d285579d","steps":["basis 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