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例子
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k列的G.f:A_k(x)=1-x+(1-2^k)*x^2+(2^(k+1)-4^k+6^k-1)*x*3+。。。
方形数组开始:
1, 1, 1, 1, 1, 1, ...
-1, -1, -1, -1, -1, -1, ...
0, -1, -3, -7, -15, -31, ...
1, 5, 27, 167, 1071, 6815, ...
0, 17, 441, 10673, 262305, 6525377, ...
-2, -121, -11529, -1337713, -161721441, -19802585281, ...
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