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例子
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a(4)=1到a(6)=20个多集分区的非同构代表:
4: {{1,3},{2,3}}
5: {{1,2},{2,3,3}}
{{1,3},{2,3,3}}
{{1,4},{2,3,4}}
{{3},{1,3},{2,3}}
6: {{1,2},{2,3,3,3}}
{{1,3},{2,2,3,3}}
{{1,3},{2,3,3,3}}
{{1,3},{2,3,4,4}}
{{1,4},{2,3,4,4}}
{{1,5},{2,3,4,5}}
{{1,1,2},{2,3,3}}
{{1,2,2},{2,3,3}}
{{1,2,3},{3,4,4}}
{{1,2,4},{3,4,4}}
{{1,2,5},{3,4,5}}
{{1,3,3},{2,3,3}}
{{1,3,4},{2,3,4}}
{{2},{1,2},{2,3,3}}
{{3},{1,3},{2,3,3}}
{{4},{1,4},{2,3,4}}
{{1,3},{2,3},{2,3}}
{{1,3},{2,3},{3,3}}
{{1,4},{2,4},{3,4}}
{{3},{3},{1,3},{2,3}}
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