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例子
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a(6)=18个完全交叉集分区:
{{1,2,3,4,5,6}}
{{1,4,6},{2,3,5}}
{{1,4,5},{2,3,6}}
{{1,3,6},{2,4,5}}
{{1,3,5},{2,4,6}}
{{1,3,4},{2,5,6}}
{{1,2,5},{3,4,6}}
{{1,2,4},{3,5,6}}
{{4,6},{1,2,3,5}}
{{3,6},{1,2,4,5}}
{{3,5},{1,2,4,6}}
{{2,6},{1,3,4,5}}
{{2,5},{1,3,4,6}}
{{2,4},{1,3,5,6}}
{{1,5},{2,3,4,6}}
{{1,4},{2,3,5,6}}
{{1,3},{2,4,5,6}}
{{1,4},{2,5},{3,6}}
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