OFFSET
3,1
COMMENTS
Counts exclude the null graph.
LINKS
Eric Weisstein's World of Mathematics, Helm Graph
Eric Weisstein's World of Mathematics, Graph Minor
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Eric W. Weisstein, Jun 02 2022
EXTENSIONS
a(8) from Eric W. Weisstein, Oct 13 2023
STATUS
approved