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EXAMPLE
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A(x) = 1 + 12*x + 60*x^2 + 90*x^3 - 558*x^4 - 2916*x^5 + 2160*x^6 +...
For n>=0, the first (n+1) coefficients of A(x)^(n+1) forms the
n-th row polynomial R_n(y) of triangle A097190:
A^1 = {1, _12, 60, 90, -558, -2916, 2160, ...}
A^2 = {1, 24, _264, 1620, 4644, -8424, -124524, ...}
A^3 = {1, 36, 612, _6318, 41526, 151956, -16308, ...}
A^4 = {1, 48, 1104, 15912, _156744, 1061424, 4423032, ...}
A^5 = {1, 60, 1740, 32130, 417690, _3966732, 27243000, ...}
A^6 = {1, 72, 2520, 56700, 912492, 11027016, _101653164, ...}
These row polynomials satisfy: R_n(1/3) = 9^n:
9^1 = 1 + 24/3;
9^2 = 1 + 36/3 + 612/3^2;
9^3 = 1 + 48/3 + 1104/3^2 + 15912/3^3;
9^4 = 1 + 60/3 + 1740/3^2 + 32130/3^3 + 417690/3^4.
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