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例子
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a(1)=1到a(7)=24反链:
{{1}} {{2}} {{3}} {{4}} {{5}}
{{1},{1}} {{1,2}} {{1,3}} {{1,4}}
{{1},{2}} {{1},{3}} {{2,3}}
{{1},{1},{1}} {{2},{2}} {{1},{4}}
{{1},{1},{2}} {{2},{3}}
{{1},{1},{1},{1}} {{1},{1},{3}}
{{1},{2},{2}}
{{1},{1},{1},{2}}
{{1},{1},{1},{1},{1}}
.
{{6}} {{7}}
{{1,5}} {{1,6}}
{{2,4}} {{2,5}}
{{1,2,3}} {{3,4}}
{{1},{5}} {{1,2,4}}
{{2},{4}} {{1},{6}}
{{3},{3}} {{2},{5}}
{{1},{2,3}} {{3},{4}}
{{2},{1,3}} {{1},{2,4}}
{{3},{1,2}} {{2},{1,4}}
{{1},{1},{4}} {{4},{1,2}}
{{1,2},{1,2}} {{1},{1},{5}}
{{1},{2},{3}} {{1,2},{1,3}}
{{2},{2},{2}} {{1},{2},{4}}
{{1},{1},{1},{3}} {{1},{3},{3}}
{{1},{1},{2},{2}} {{2},{2},{3}}
{{1},{1},{1},{1},{2}} {{1},{1},{2,3}}
{{1},{1},{1},{1},{1}}{1},{1},{4}}
{{1},{1},{2},{3}}
{{1}、{2}、{2}、{2}}
{{1}、{1}、{1}、{1}、{3}}
{{1},{1},{1},{2},{2}}
{{1},{1},{1},{1},{1},{2}}
{{1},{1},{1},{1},{1},{1},{1}}
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