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例子
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a(3)=19个正则超图:
{{1,2,3}}
{{1},{2,3}}
{{2},{1,3}}
{{3},{1,2}}
{{1},{2},{3}}
{{1},{2,3},{1,2,3}}
{{2},{1,3},{1,2,3}}
{{3},{1,2},{1,2,3}}
{{1,2},{1,3},{2,3}}
{{1},{2},{3},{1,2,3}}
{{1},{2},{1,3},{2,3}}
{{1},{3},{1,2},{2,3}}
{{2},{3},{1,2},{1,3}}
{{1,2},{1,3},{2,3},{1,2,3}}
{{1},{2},{1,3},{2,3},{1,2,3}}
{{1},{3},{1,2},{2,3},{1,2,3}}
{{2}、{3}、{1,2}、{1,3}、{1,3}}
{{1},{2},{3},{1,2},{1,3},{2,3}}
{{1},{2},{3},{1,2},{1,3},{2,3},{1,2,3}}
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