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例子
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A(6,1)=6*Sum_{j=1..6}二项式(j,6-j)/j=6*(1/3+3/2+1+1/6)=18。
A(6,2)=6*Sum_{j=1..3}二项式(j,6-2*j)/j=6*(1/2+1/3)=5。
方形数组开始:
2, 3, 4, 5, 6, 7, 8, 9, 10, 11, ...
1, 0, 0, 0, 0, 0, 0, 0, 0, 0, ...
3, 2, 0, 0, 0, 0, 0, 0, 0, 0, ...
4, 3, 3, 0, 0, 0, 0, 0, 0, 0, ...
7, 2, 4, 4, 0, 0, 0, 0, 0, 0, ...
11, 5, 0, 5, 5, 0, 0, 0, 0, 0, ...
18, 5, 3, 0, 6, 6, 0, 0, 0, 0, ...
29, 7, 7, 0, 0, 7, 7, 0, 0, 0, ...
47, 10, 4, 4, 0, 0, 8, 8, 0, 0, ...
76, 12, 3, 9, 0, 0, 0, 9, 9, 0, ...
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