搜索: 编号:a201046
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A201046号
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| 由7个元素组成的-n..n数组的数量,相邻元素的差异也在-n..n.中。 |
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+0 1
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577, 17981, 182349, 1042167, 4211559, 13497523, 36644243, 87831605, 191065045, 384593857, 726495089, 1301560155, 2229621291, 3675454983, 5860399495, 9075823625, 13698583817, 20208606757, 29208734581, 41446969823, 57841257231
(列表;图表;参考;听;历史;文本;内部格式)
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1,1
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配方奶粉
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经验:a(n)=(17141/630)*n^7+(17141/180)*n*6+(28177/180)*n^5+(2759/18)*n_4+(17299/180)*1n^3+(6929/180)xn^2+(1921/210)*n+1。
通用格式:x*(577+13365*x+54657*x^2+54531*x^3+13449*x^4+541*x^5+9*x^6-x^7)/(1-x)^8。
对于n>8,a(n)=8*a(n-1)-28*a(n-2)+56*a(n-3)-70*a(n-4)+56*a(n-5)-28*a(n-6)+8*a(n-7)-a(n-8)。
(结束)
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例子
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n=2的一些解决方案:
..1...-1....0....1....2....2....0....0...-2....1...-1....0....2...-2....0....1
..0...-2....0....1....0....2....2....1...-2....2....1....0....2...-1...-1....0
..0....0....0....2...-2....2....0....1....0....0....1...-1....2....1...-1...-2
..0….2…-1….1…-1….0…-1….0….0….0….1….0….2….2…-2…-1
.-1....2....0....1....1...-1...-1...-1....2....2....2....1....1....0....0....0
.-2....2....0....1....0....1....1...-2....0....0....1....1....1....1....2....0
.-2....2....1....1...-1...-1...-1...-1....2...-2...-1...-1...-1....2....2...-2
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