OFFSET
0,3
COMMENTS
A partially ordered set is graded if all maximal chains have the same length. This is called tiered by some authors.
LINKS
Andrew Howroyd, Table of n, a(n) for n = 0..40
PROG
(Sage) sum(1 for P in posets(n) if P.is_graded())
(PARI) \\ See PARI link in A361957 for program code.
A361912seq(20) \\ Andrew Howroyd, Apr 03 2023
CROSSREFS
KEYWORD
nonn
AUTHOR
Martin Rubey, Mar 29 2023
EXTENSIONS
Terms a(8) and beyond from Andrew Howroyd, Mar 30 2023
STATUS
approved