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1, 3, 4, 6, 9, 10, 10, 16, 19, 20, 15, 25, 31, 34, 35, 21, 36, 46, 52, 55, 56, 28, 49, 64, 74, 80, 83, 84, 36, 64, 85, 100, 110, 116, 119, 120, 45, 81, 109, 130, 145, 155, 161, 164, 165, 55, 100, 136, 164, 185, 200, 210, 216, 219, 220
(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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1,2
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评论
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右边框=四面体数字,左边框=三角形数字。
或者这是方形阵列A(n,k)
1, 3, 6, 10, 15, 21, 28, 36, 45, 55, ...
4, 9, 16, 25, 36, 49, 64, 81, 100, 121, ...
10, 19, 31, 46, 64, 85, 109, 136, 166, 199, ...
20, 34, 52, 74, 100, 130, 164, 202, 244, 290, ...
35, 55, 80, 110, 145, 185, 230, 280, 335, 395, ...
56, 83, 116, 155, 200, 251, 308, 371, 440, 515, ...
...
由反对角线读取,其中A(n,k)=n*(n^2+3*k*n+3*k^2-1)/6是从A000217号(k) ●●●●-R.J.马塔尔2015年5月6日
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链接
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配方奶粉
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T(n,k)=k*(k^2-3*k*n-3*k+3*n^2+6*n+2)/6-R.J.马塔尔2022年8月31日
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例子
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三角形的前几行:
1;
3, 4;
6、9、10;
10, 16, 19, 20;
15, 25, 31, 34, 35;
21, 36, 46, 52, 55, 56;
28, 49, 64, 74, 80, 83, 84;
36, 64, 85, 100, 110, 116, 119, 120;
...
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MAPLE公司
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k*(k^2-3*k*n-3*k+3*n^2+6*n+2)/6;
结束进程:
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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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