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例子
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a(1)=1到a(5)=16组具有不同块大小的分区:
{{1}} {{1,2}} {{1,2,3}} {{1,2,3,4}} {{1,2,3,4,5}}
{{1},{2,3}}{1},{2,3,4}}{1},{2,3,4,5}}
{{1,2},{3}}{1,2,3},{4}}{1,2},{3,4,5}}
{{1,3},{2}} {{1,2,4},{3}} {{1,2,3},{4,5}}
{{1,3,4},{2}} {{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},{2,4,5}}
{{1,3,4},{2,5}}
{{1,3,4,5},{2}}
{{1,3,5},{2,4}}
{{1,4},{2,3,5}}
{{1,4,5},{2,3}}
{{1,5},{2,3,4}}
(结束)
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