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例子
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a(1)=1到a(5)=10个平衡集分区(空列用点表示):
{{1}} . {{1},{2,3}} {{1,2},{3,4}} {{1},{2},{3,4,5}}
{{1,2},{3}} {{1,3},{2,4}} {{1},{2,3,4},{5}}
{{1,3},{2}} {{1,4},{2,3}} {{1,2,3},{4},{5}}
{{1},{2,3,5},{4}}
{{1,2,4},{3},{5}}
{{1},{2,4,5},{3}}
{{1,2,5},{3},{4}}
{{1,3,4},{2},{5}}
{{1,3,5},{2},{4}}
{{1,4,5},{2},{3}}
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