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begins:\n  0:   1;\n  1:   2,    3;\n  2:   4,   12,     9;\n  3:   8,   36,    54,     27;\n  4:  16,   96,   216,    216,     81;\n  5:  32,  240,   720,   1080,    810,    243;\n  6:  64,  576,  2160,   4320,   4860,   2916,    729;\n  7: 128, 1344,  6048,  15120,  22680,  20412,  10206,   2187;\n  8: 256, 3072, 16128,  48384,  90720, 108864,  81648,  34992,   6561;\n  9: 512, 6912, 41472, 145152, 326592, 489888, 489888, 314928, 118098, 19683;\n","recurrence_sentence":"The row polynomials satisfy P(n,x) = (2+3*x)*P(n-1,x) for n >= 1, with P(0,x) = 1.","mathematica":"P[0, x_] := 1;\nP[n_, x_] := P[n, x] = Expand[(2 + 3*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] = 1; for(n = 1, N, my(i = n + 1); v[i] = (2 + 3*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, 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