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例子
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a(1)=1到a(3)=14集合系统的非同构代表:
{{1}} {{1,2}} {{1,2,3}}
{{1},{2}} {{1},{2,3}}
{{2},{1,2}} {{1},{2},{3}}
{{1,3},{2,3}}
{{3},{1,2,3}}
{{1},{3},{2,3}}
{{2,3},{1,2,3}}
{{2},{1,3},{2,3}}
{{2},{3},{1,2,3}}
{{3},{1,3},{2,3}}
{{1},{2},{3},{2,3}}
{{3},{2,3},{1,2,3}}
{{2},{3},{1,3},{2,3}}
{{2},{3},{2,3},{1,2,3}}
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