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A326573型 |
| {1..n}子集的连接反链数,所有反链的和都不同。 |
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5
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抵消
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0,4
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评论
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反链是有限集合的有限集合,其中没有一个是其他集合的子集。如果它的并集是{1..n},则它是覆盖的。边和是每条边中顶点的和,因此例如,{{1,3}、{2,5}、}3,4,5}}的边和是{4,7,12}。
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链接
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例子
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a(3)=5反链:
{{1,2,3}}
{{1,3},{2,3}}
{{1,2},{2,3}}
{{1,2},{1,3}}
{{1,2},{1,3},{2,3}}
a(4)=59反链:
{1234}{12}{134}{12}{13}{14}{12}{13}{14}{24}{12}{13}{14}{24}{34}
{12} {234}{12}{13}{24}{12}{13}{14}{34}{12}{13}{23}{24}{34}
{13}{124} {12}{13}{34} {12}{13}{23}{24}
{13}{234} {12}{14}{34} {12}{13}{23}{34}
{14}{123} {12}{23}{24} {12}{13}{24}{34}
{14}{234} {12}{23}{34} {12}{14}{24}{34}
{23}{124} {12}{24}{34} {12}{23}{24}{34}
{23}{134} {13}{14}{24} {13}{14}{24}{34}
{24}{134} {13}{23}{24} {13}{23}{24}{34}
{34}{123} {13}{23}{34} {12}{13}{14}{234}
{123}{124} {13}{24}{34} {12}{23}{24}{134}
{123}{134} {14}{24}{34} {123}{124}{134}{234}
{123}{234} {12}{13}{234}
{124}{134} {12}{14}{234}
{124}{234} {12}{23}{134}
{134}{234} {12}{24}{134}
{13}{14}{234}
{13}{23}{124}
{14}{34}{123}
{23}{24}{134}
{12}{134}{234}
{13}{124}{234}
{14}{123}{234}
{23}{124}{134}
{123}{124}{134}
{123}{124}{234}
{123}{134}{234}
{124}{134}{234}
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交叉参考
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关键词
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非n,更多
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作者
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状态
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经核准的
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