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例子
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a(1)=1到a(5)=14反链:
{{1}} {{1,2}} {{1,2,3}} {{1,2,3,4}} {{1,2,3,4,5}}
{{3},{1,2}} {{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}}
{{5},{1,4},{2,3}}
{{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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