a(1)=1到a(6)=23反链:
{{1}} {{2}} {{3}} {{4}} {{5}} {{6}}
{{1,1}} {{1,2}} {{1,3}} {{1,4}} {{1,5}}
{{1,1,1}} {{2,2}} {{2,3}} {{2,4}}
{{1},{2}} {{1,1,2}} {{1,1,3}} {{3,3}}
{{1},{3}} {{1,2,2}} {{1,1,4}}
{{1,1,1,1}} {{1},{4}} {{1,2,3}}
{{2},{1,1}} {{2},{3}} {{1},{5}}
{{1,1,1,2}} {{2,2,2}}
{{1},{2,2}} {{2},{4}}
{{3},{1,1}} {{1,1,1,3}}
{{1,1,1,1,1}} {{1,1,2,2}}
{{1,1},{1,2}} {{1},{2,3}}
{{2},{1,1,1}} {{2},{1,3}}
{{3},{1,2}}
{{4},{1,1}}
{{1,1,1,1,2}}
{{1,1},{1,3}}
{{1,1},{2,2}}
{{1},{2},{3}}
{{3},{1,1,1}}
{{1,1,1,1,1,1}}
{{1,2},{1,1,1}}
{{2},{1,1,1,1}}