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例子
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a(1)=1到a(4)=15个多集分区:
{{1}} {{1,1}} {{1,1,1}} {{1,1,1,1}}
{{1,2}} {{1,1,2}} {{1,1,1,2}}
{{1},{1}} {{1,2,3}} {{1,1,2,2}}
{{1},{1,1}} {{1,1,2,3}}
{{1},{1,2}} {{1,2,3,4}}
{{1},{1},{1}} {{1},{1,1,1}}
{{1,1},{1,1}}
{{1},{1,1,2}}
{{1,1},{1,2}}
{{1},{1,2,2}}
{{1},{1,2,3}}
{{1,2},{1,2}}
{{1},{1},{1,1}}
{{1},{1},{1,2}}
{{1},{1},{1},{1}}
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