a(1)=1到a(5)=17个多集分区:
{{1}} {{2}} {{3}} {{4}} {{5}}
{{1,1}} {{1,1,1}} {{2,2}} {{1,1,3}}
{{1},{2}} {{1,1,2}} {{1,2,2}}
{{1},{1,1}} {{1},{3}} {{1},{4}}
{{1,1,1,1}} {{2},{3}}
{{1},{1,2}} {{1,1,1,2}}
{{2},{1,1}} {{1},{1,3}}
{{1},{1,1,1}} {{1},{2,2}}
{{2},{1,2}}
{{3},{1,1}}
{{1,1,1,1,1}}
{{1},{1,1,2}}
{{1,1},{1,2}}
{{2},{1,1,1}}
{{1},{1,1,1,1}}
{{1,1},{1,1,1}}
{{1},{2},{1,1}}