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例子
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a(2)=1到a(5)=13反链:
{{1,2}} {{1,2,3}} {{1,2,3,4}} {{1,2,3,4,5}}
{{1,4},{2,3}} {{1,2,5},{1,3,4}}
{{2,4},{1,2,3}}{1,3,5},{2,3,4}}
{{3,4},{1,2,4}} {{1,4,5},{2,3,5}}
{{1,4,5},{1,2,3,4}}
{{2,3,5},{1,2,3,4}}
{{2,4,5},{1,2,3,5}}
{{3,4,5},{1,2,4,5}}
{{1,5},{2,4},{1,2,3}}
{{2,5},{3,4},{1,2,4}}
{{3,5}、{1,2,5}、{1,3,4}
{{4,5},{1,3,5},{2,3,4}}
{{1,4,5},{2,3,5},{1,2,3,4}}
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