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例子
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A(3,2)=16:3aaa、3aab、3abb、3bbb、2aa1a、2aab1、2ab1b、2bb1a、2 bb1b、1aaaa、1a2ab、1b2ba、1b2ab、1b2ab、2b2bb。
方阵A(n,k)开始:
1, 1, 1, 1, 1, 1, 1, 1, ...
0, 1, 2, 3, 4, 5, 6, 7, ...
0, 1, 3, 6, 10, 15, 21, 28, ...
0, 3, 16, 46, 100, 185, 308, 476, ...
0, 3, 21, 75, 195, 420, 798, 1386, ...
0, 5, 50, 231, 736, 1876, 4116, 8106, ...
0, 11, 205, 1414, 6032, 19320, 51114, 117936, ...
0, 13, 292, 2376, 11712, 42610, 126288, 322764, ...
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