a(1)=1到a(5)=16个多集分区的非同构代表:
{{1}} {{1,2}} {{1,2,3}} {{1,2,3,4}}
{{1},{1}} {{1},{2,2}} {{1,1},{2,2}}
{{2},{1,2}} {{1,2},{1,2}}
{{1},{1},{1}} {{1,2},{2,2}}
{{1},{2,3,3}}
{{3},{1,2,3}}
{{1},{1},{2,2}}
{{1},{2},{1,2}}
{{1},{2},{2,2}}
{{2},{2},{1,2}}
{{1},{1},{1},{1}}