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例子
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A(3,2)=10:{1,2,3},{1,2,5},}1,3,4},1,3,6},[1,4,5}、{1,5,6},{2,3,5},2,4,6}。
A(2,3)=5:{1,2},{1,5},{2,4},{3,6},{4,5}。
方阵A(n,k)开始:
1, 1, 1, 1, 1, 1, 1, 1, ...
0, 1, 1, 1, 1, 1, 1, 1, ...
0, 1, 2, 5, 6, 9, 10, 13, ...
0, 1, 10, 30, 55, 91, 138, 190, ...
0, 1, 38, 165, 460, 969, 1782, 2925, ...
0, 1, 126, 1001, 3876, 10630, 23751, 46376, ...
0, 1, 452, 6198, 33594, 118755, 324516, 749398, ...
0, 1, 1716, 38760, 296010, 1344904, 4496388, 12271518, ...
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