|
| |
|
| A326882型 |
| 按行读取的不规则三角形，其中T（n，k）是具有n个点和k个非空开集的有限拓扑的数目，0<=k<=2^n-1。 |
|
14
|
|
|
|
1, 0, 1, 0, 1, 2, 1, 0, 1, 6, 9, 6, 6, 0, 1, 0, 1, 14, 43, 60, 72, 54, 54, 20, 24, 0, 12, 0, 0, 0, 1, 0, 1, 30, 165, 390, 630, 780, 955, 800, 900, 500, 660, 240, 390, 120, 190, 10, 100, 0, 60, 0, 0, 0, 20, 0, 0, 0, 0, 0, 0, 0, 1
(列表;图表;参考;听;历史;文本;内部格式)
|
|
|
|
抵消
|
0,6
|
|
|
链接
|
|
|
|
例子
|
三角形开始：
1
0 1
0 1 2 1
0 1 6 9 6 6 0 1
0 1 14 43 60 72 54 54 20 24 0 12 0 0 0 1
第n=3行统计以下拓扑：
{}{123} {}{1}{123} {}{1}{12}{123} {}{1}{2}{12}{123} {}{1}{2}{12}{13}{123}
{}{2}{123} {}{1}{13}{123} {}{1}{3}{13}{123} {}{1}{2}{12}{23}{123}
{}{3}{123} {}{1}{23}{123} {}{2}{3}{23}{123} {}{1}{3}{12}{13}{123}
{}{12}{123} {}{2}{12}{123} {}{1}{12}{13}{123} {}{1}{3}{13}{23}{123}
{}{13}{123} {}{2}{13}{123} {}{2}{12}{23}{123} {}{2}{3}{12}{23}{123}
{}{23}{123} {}{2}{23}{123} {}{3}{13}{23}{123} {}{2}{3}{13}{23}{123}
{}{3}{12}{123}
{}{3}{13}{123} {}{1}{2}{3}{12}{13}{23}{123}
{}{3}{23}{123}
|
|
|
数学
|
表[Length[Select[Subsets[Subsets[Range[n]]，{k}]，MemberQ[#，{}]&&MemberQ[#，Range[n]]&&SubsetQ[#、Union[Union@@Tuples[#，2]，Intersection@@Tuples[#，2]]&]]，}n，{n，0，4}，{k，2^n}]
|
|
|
交叉参考
|
|
|
|
关键字
|
非n,标签,美好的
|
|
|
作者
|
|
|
|
扩展
|
|
|
|
状态
|
经核准的
|
| |
|
|
