搜索: 编号:a250381
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A250381型
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| 长度为n+30..2且没有四个连续项的数组的数量,其中任何两个项的最大值等于其余两个项中的最小值。 |
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42, 78, 146, 274, 514, 966, 1816, 3414, 6418, 12066, 22688, 42658, 80208, 150808, 283566, 533182, 1002538, 1885048, 3544452, 6664608, 12531430, 23562750, 44304934, 83306386, 156640636, 294530672, 553804746, 1041316906, 1957983912
(列表;图表;参考;听;历史;文本;内部格式)
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配方奶粉
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经验递归:a(n)=a(n-1)+2*a(n-2)-a(n-3)+3*a(n-4)-a“n-5”-7*a“n-6”+a“n-7”+a(n-10)。
经验公式:2*x*(21+18*x-8*x^2+7*x^3-50*x^4-71*x^5+15*x^6+4*x^7+7*x^8+12*x^9)/(1-x-2*x*2+x^3-3*x^4+x^5+7*x ^6-x^7-x^10)。
(结束)
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例子
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n=6的一些解
..1....1....2....2....1....0....2....1....0....0....1....0....1....0....2....1
..0....2....0....0....0....0....1....2....1....2....0....2....0....1....0....0
..0....2....1....2....1....1....2....2....2....1....2....2....2....0....0....2
..2....1....2....0....0....2....0....0....0....0....0....1....0....1....1....0
..2....0....0....1....1....2....2....1....2....2....2....0....1....0....1....2
..0....2....2....0....0....1....1....2....1....2....0....2....2....1....0....1
..1....2....1....2....2....0....2....0....0....1....1....0....0....0....0....0
..2….0….2….2….0….2….1….0….2….0….2….2….0….2….1….2
..2....1....1....0....2....2....2....2....0....2....2....0....2....2....1....0
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