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例子
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A(1,3)=5:[(1,1,1)],[(1,1,0),(0,0,1)],[1,0,1,(0,1,0)],[C,0,0)(0,1,1),[0,1,1),(1,0,0。
A(2,2)=9:[(2,2,)],[(2,1),(0,1。
方阵A(n,k)开始:
1, 1, 1, 1, 1, 1, 1, 1, ...
1, 1, 2, 5, 15, 52, 203, 877, ...
1, 2, 9, 66, 712, 10457, 198091, 4659138, ...
1, 3, 31, 686, 27036, 1688360, 154703688, ...
1, 5, 109, 6721, 911838, 231575143, ...
1, 7, 339, 58616, 26908756, ...
1, 11, 1043, 476781, ...
1, 15, 2998, ...
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