OFFSET
0,21
LINKS
Jason Kimberley, Disconnected regular graphs (with girth at least 3)
Jason Kimberley, Index of sequences counting disconnected k-regular simple graphs with girth at least g
Eric Weisstein's World of Mathematics, Disconnected Graph
Eric Weisstein's World of Mathematics, Octic Graph
FORMULA
EXAMPLE
The a(18)=1 graph is K_9+K_9.
CROSSREFS
8-regular simple graphs: A014378 (connected), this sequence (disconnected), A180260 (not necessarily connected).
KEYWORD
nonn,hard
AUTHOR
Jason Kimberley, Sep 29 2009
EXTENSIONS
Terms a(26) and beyond from Andrew Howroyd, May 20 2020
STATUS
approved