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例子
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A(x;t)=1+(2+t)*x+(10+9*t+t^2)*x^2+(74+91*t+23*t^2+t^3)*x*3+。。。
三角形开始:
n\k[0][1][2][3][4][5][6][7][8]
[0] 1;
[1] 2, 1;
[2] 10, 9, 1;
[3] 74, 91, 23, 1;
[4] 706, 1063, 416, 46, 1;
[5] 8162, 14193, 7344, 1350, 80, 1;
[6] 110410, 213953, 134613, 34362, 3550, 127, 1;
[7] 1708394, 3602891, 2620379, 842751, 125195, 8085, 189, 1;
[8] 29752066, 67168527, 54636792, 20862684, 4009832, 382358, 16576, 268, 1;
[9] ...
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