OFFSET
0,3
COMMENTS
Sum of e(P) over all nonisomorphic n-element posets, where e(P) is the number of linear extensions of P.
EXAMPLE
There is one 3-element poset with 6 linear extensions, one with 3, two with 2, and one with 1, for a total of 14.
KEYWORD
nonn,more
AUTHOR
Richard Stanley, Jul 27 2020
STATUS
approved