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例子
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a(0)=1最大反链是{}。
a(1)=2最大反链为{},{1}。
a(2)=3个最大反链{}、{1}{2}和{12}。
a(3)=5最大反链的代表是:{},{1}{2}{3},}12}{3{,{12}{13}{23},f123}。
a(4)=10最大反链的代表是:
{}, {1}{2}{3}{4},
{12}{3}{4}, {12}{13}{23}{4},
{123}{4}, {12}{13}{24}{14}{24}{34},
{123}{14}{24}{34}, {123}{124}{34},
{123}{124}{134}{234}, {1234}.
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