搜索: 编号:a246740
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A246740型
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| 长度为3+4 0..n的数组的数量,在任何连续的五项中没有对,总计正好为n |
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+0 1
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2, 22, 548, 2884, 18966, 66378, 241544, 643048, 1687850, 3716830, 7980972, 15368172, 28868798, 50412754, 86141456, 139758928, 222590034, 341128998, 514651700, 753789460, 1089386342, 1537935322, 2146429848, 2939373624
(列表;图表;参考;听;历史;文本;内部格式)
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抵消
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1,1
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评论
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链接
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公式
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经验公式:a(n)=3*a(n-1)+2*a(n-2)-14*a(n-3)+5*a(-n-4)+25*a(ns-5)-20*a(nm-6)-20*1(n-7)+25*1
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例子
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n=4的一些解
..2....4....1....3....2....0....4....3....0....4....0....4....3....3....4....4
..4....4....2....3....1....3....3....2....3....1....1....1....3....2....1....3
..4....4....1....3....1....0....3....0....2....1....0....4....3....4....4....4
..3....1....1....3....1....3....3....0....0....2....2....2....4....4....1....3
..4....2....1....2....1....3....2....3....3....4....1....1....2....4....2....3
..3....4....1....0....0....0....3....3....3....1....1....1....3....4....1....2
..4....1....2....3....1....0....3....3....3....1....1....4....4....2....4....3
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关键字
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非n
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作者
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状态
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经核准的
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