OFFSET
3,1
COMMENTS
Also the number of independent vertex sets in the complement of the n-cycle graph. - Eric W. Weisstein, Oct 11 2023
LINKS
Eric Weisstein's World of Mathematics, Clique
Eric Weisstein's World of Mathematics, Cycle Complement Graph
Eric Weisstein's World of Mathematics, Cycle Graph
Eric Weisstein's World of Mathematics, Independent Vertex Set
FORMULA
a(n) = 2*n+1 for n > 3.
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Eric W. Weisstein, Jun 09 2019
STATUS
approved