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例子
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a(1)=1到a(5)=16多集分区的非同构表示:
{{1}} {{1,2}} {{1,2,3}} {{1,2,3,4}}
{{1},{1}} {{1},{2,2}} {{1,1},{2,2}}
{{2},{1,2}} {{1,2},{1,2}}
{{1},{1},{1}} {{1,2},{2,2}}
{{1},{2,3,3}}
{{3},{1,2,3}}
{{1},{1},{2,2}}
{{1},{2},{1,2}}
{{1},{2},{2,2}}
{{2},{2},{1,2}}
{{1},{1},{1},{1}}
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