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例子
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a(0)=1到a(3)=22套系统:
{} {} {} {}
{{1}} {{1}} {{1}}
{{2}} {{2}}
{{1},{1,2}} {{3}}
{{2},{1,2}} {{1},{1,2}}
{{1},{1,3}}
{{2},{1,2}}
{{2},{2,3}}
{{3},{1,3}}
{{3},{2,3}}
{{1},{1,2},{1,3}}
{{2},{1,2},{2,3}}
{{3},{1,3},{2,3}}
{{1},{1,2},{1,2,3}}
{{1},{1,3},{1,2,3}}
{{2},{1,2},{1,2,3}}
{{2},{2,3},{1,2,3}}
{{3},{1,3},{1,2,3}}
{{3},{2,3},{1,2,3}}
{{1},{1,2},{1,3},{1,2,3}}
{{2},{1,2},{2,3},{1,2,3}}
{{3},{1,3},{2,3},{1,2,3}}
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