DownStepMajorIndex on DyckPath
The major index counting positions in down steps only: over each valley, the number of down steps up to and including its down step; summed.
Called as CombinatorialStat(x, "DownStepMajorIndex"). The head's page has its examples.
Live
Distribution
Over DyckPaths at each size, tallied here in your browser; sizes past 10 are not offered.
FindStat St000947
The major index east count of a Dyck path.
| Object | Value |
|---|---|
[1,0,1,0] | 1 |
[1,1,0,0] | 0 |
[1,0,1,0,1,0] | 3 |
[1,0,1,1,0,0] | 1 |
[1,1,0,0,1,0] | 2 |
[1,1,0,1,0,0] | 1 |
[1,1,1,0,0,0] | 0 |
[1,0,1,0,1,0,1,0] | 6 |
Data from FindStat, the combinatorial statistic finder; the page at findstat.org/St000947 has the rest.