|
例子
|
a(0)=1到a(4)=13套系统:
{} {{1}} {{1},{2}} {{1},{2},{3}} {{1},{2},{3},{4}}
{{1},{1,2}} {{1},{2},{1,3}} {{1},{2},{3},{1,4}}
{{1},{1,2},{1,3}} {{1},{2},{1,2},{3,4}}
{{1},{1,2},{2,3}}{1},{2},{1,3},{1,4}}
{{1,2},{1,3},{2,3}}{1},{2},{1,3},{2,4}}
{{1},{2},{1,3},{3,4}}
{{1},{1,2},{1,3},{1,4}}
{{1},{1,2},{1,3},{2,4}}
{{1},{1,2},{2,3},{2,4}}
{{1},{1,2},{2,3},{3,4}}
{{1},{2,3},{2,4},{3,4}}
{{1,2},{1,3},{1,4},{2,3}}
{{1,2},{1,3},{2,4},{3,4}}
|