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例子
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a(1)=1到a(4)=17个多集分区的非同构代表:
{{1}} {{1,2}} {{1,2,3}} {{1,2,3,4}}
{{1},{1}} {{1},{2,3}} {{1,2},{1,2}}
{{1},{2}} {{2},{1,2}} {{1},{2,3,4}}
{{1},{1},{1}} {{1,2},{3,4}}
{{1},{2},{2}} {{1,3},{2,3}}
{{1},{2},{3}} {{2},{1,2,2}}
{{3},{1,2,3}}
{{1},{1},{2,3}}
{{1},{2},{1,2}}
{{1},{2},{3,4}}
{{1},{3},{2,3}}
{{2},{2},{1,2}}
{{1},{1},{1},{1}}
{{1},{1},{2},{2}}
{{1},{2},{2},{2}}
{{1},{2},{3},{3}}
{{1},{2},{3},{4}}
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