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例子
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a(4)=29反链:
{}
{{}}
{{1,2},{1,3},{2,3}}
{{1,2},{1,4},{2,4}}
{{1,3},{1,4},{3,4}}
{{2,3},{2,4},{3,4}}
{{1,2},{1,3},{2,3,4}}
{{1,2},{1,4},{2,3,4}}
{{1,2},{2,3},{1,3,4}}
{{1,2},{2,4},{1,3,4}}
{{1,3},{1,4},{2,3,4}}
{{1,3},{2,3},{1,2,4}}
{{1,3},{3,4},{1,2,4}}
{{1,4},{2,4},{1,2,3}}
{{1,4},{3,4},{1,2,3}}
{{2,3},{2,4},{1,3,4}}
{{2,3},{3,4},{1,2,4}}
{{2,4},{3,4},{1,2,3}}
{{1,2},{1,3,4},{2,3,4}}
{{1,3},{1,2,4},{2,3,4}}
{{1,4},{1,2,3},{2,3,4}}
{{2,3},{1,2,4},{1,3,4}}
{{2,4},{1,2,3},{1,3,4}}
{{3,4},{1,2,3},{1,2,4}}
{{1,2},{1,3},{1,4},{2,3,4}}
{{1,2},{2,3},{2,4},{1,3,4}}
{{1,3},{2,3},{3,4},{1,2,4}}
{{1,4}、{2,4}、{3,4}、{1,2,3}
{{1,2,3}、{1,2,4}、{1,3,4}、{2,3,4}
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