OFFSET
1,2
COMMENTS
Pseudographs are finite graphs with undirected edges without identity, where parallel edges between the same vertices and loops are allowed.
FORMULA
Apparently a(n) = A258589(n-2) + 2 for n>= 4, i.e., terms satisfy linear recurrence a(n) = a(n-1) + a(n-2) - a(n-3) for n>=7. - Hugo Pfoertner, Dec 02 2022
CROSSREFS
KEYWORD
nonn
AUTHOR
Lars Göttgens, Nov 04 2022
STATUS
approved