OFFSET
1,2
COMMENTS
The definition of a one-level grid poset can be found in the Pan links. The number of linear extensions of the one-level grid poset G[(0^n), (0^(n-1)), (0^(n-1))] is given by Catalan number A000108(n), the number of linear extensions of the one-level grid poset G[(1^n), (0^(n-1)), (0^(n-1))] is given by A274644(n) and the number of linear extensions of the one-level grid poset G[(1^n), (1^(n-1)), (0^(n-1))] is given by A274763(n).
LINKS
Ran Pan, Problem 1, Project P.
CROSSREFS
KEYWORD
nonn
AUTHOR
Ran Pan, Jul 05 2016
STATUS
approved