OFFSET
0,1
COMMENTS
It is known that the sequence of orders of the iterated clique graphs of the icosahedron goes to infinity.
LINKS
Miguel A. Pizaña, The icosahedron is clique divergent, Discrete Mathematics, 262 (Feb. 2003), pp. 229-239.
EXAMPLE
By definition, the zeroth iterated clique graph of a graph G is equal to G itself; since the icosahedron has 12 vertices, a(0)=12.
The first iterated clique graph of the icosahedron has 20 vertices; hence, a(1)=20.
PROG
(YAGS) K:=CliqueGraph;; g:=Icosahedron;; kg:=K(g);; Order(kg);
# It outputs the number of vertices in the first iterated
# clique graph of the icosahedron.
CROSSREFS
KEYWORD
nonn,more
AUTHOR
José Hernández, Feb 01 2018
STATUS
approved