搜索: a131910-编号:a131910
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A131909号
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| 三角形,按行读取,其中T(n,k)=T(n-1,k-2)+T(n-1,k-1)表示n>=k>1,T(0,0)=1,T。 |
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+10 1
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1, 1, 1, 1, 1, 2, 2, 1, 2, 3, 3, 2, 3, 3, 5, 5, 3, 5, 5, 6, 8, 8, 5, 8, 8, 10, 11, 14, 14, 8, 13, 13, 16, 18, 21, 25, 25, 14, 22, 21, 26, 29, 34, 39, 46, 46, 25, 39, 36, 43, 47, 55, 63, 73, 85, 85, 46, 71, 64, 75, 79, 90, 102, 118, 136, 158, 158, 85, 131, 117, 135, 139, 154, 169
(列表;桌子;图表;参考;听;历史;文本;内部格式)
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抵消
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0,6
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评论
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链接
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公式
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例子
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三角形开始:
1;
1, 1;
1, 1, 2;
2, 1, 2, 3;
3, 2, 3, 3, 5;
5, 3, 5, 5, 6, 8;
8, 5, 8, 8, 10, 11, 14;
14, 8, 13, 13, 16, 18, 21, 25;
25, 14, 22, 21, 26, 29, 34, 39, 46;
46, 25, 39, 36, 43, 47, 55, 63, 73, 85;
85, 46, 71, 64, 75, 79, 90, 102, 118, 136, 158;
158, 85, 131, 117, 135, 139, 154, 169, 192, 220, 254, 294; ...
图示T(n,k)=T(n-1,k-2)+T(n-1,k-1):
T(5,3)=T(4,1)+T(4,2)=2+3=5;
T(6.4)=T(5.2)+T(5.3)=5+5=10;
T(8.3)=T(7.1)+T(7.2)=8+13=21。
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黄体脂酮素
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(PARI)T(n,k)=如果(k<0||n<k,0,如果(n==0&&k==0,1,如果(k==0,T(n-1,n-1),T(n-1,k-2)+T(n-1,k-1)))
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交叉参考
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关键词
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作者
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状态
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经核准的
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