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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(空列用点表示):
{{1}} . {{1},{1,1}} {{1,1},{1,1}} {{1},{1},{1,1,1}}
{{1},{2,2}} {{1,1},{2,2}} {{1},{1},{1,2,2}}
{{1},{2,3}} {{1,2},{1,2}} {{1},{1},{2,2,2}}
{{2},{1,2}} {{1,2},{2,2}} {{1},{1},{2,3,3}}
{{1,2},{3,3}} {{1},{1},{2,3,4}}
{{1,2},{3,4}} {{1},{2},{1,2,2}}
{{1,3},{2,3}} {{1},{2},{2,2,2}}
{{1},{2},{2,3,3}}
{{1},{2},{3,3,3}}
{{1},{2},{3,4,4}}
{{1},{2},{3,4,5}}
{{1},{3},{2,3,3}}
{{1},{4},{2,3,4}}
{{2},{2},{1,2,2}}
{{2},{3},{1,2,3}}
{{3},{3},{1,2,3}}
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