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例子
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a(3)=18组集合分区:
0
{{1,2,3}}
{{1,3},{2}}
{{1,2},{3}}
{{1},{2,3}}
{{1},{2},{3}}
{{1,2},{3}} {{1,3},{2}}
{{1},{2,3}} {{1,3},{2}}
{{1},{2,3}} {{1,2},{3}}
{{1},{2},{3}} {{1,2,3}}
{{1},{2},{3}} {{1,3},{2}}
{{1},{2},{3}} {{1,2},{3}}
{{1},{2},{3}} {{1},{2,3}}
{{1},{2,3}} {{1,2},{3}} {{1,3},{2}}
{{1},{2},{3}}{1,2},{3}}{1,3},{2}}
{{1},{2},{3}} {{1},{2,3}} {{1,3},{2}}
{{1},{2},{3}} {{1},{2,3}} {{1,2},{3}}
{{1},{2},{3}} {{1},{2,3}} {{1,2},{3}} {{1,3},{2}}
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