OFFSET
3,7
LINKS
Andries E. Brouwer, Cages
Geoff Exoo, Regular graphs of given degree and girth
G. Exoo and R. Jajcay, Dynamic cage survey, Electr. J. Combin. (2008, 2011).
Gordon Royle, Cages of higher valency
Eric Weisstein's World of Mathematics, Cage Graph (claims too much)
EXAMPLE
a(12) = 1 from the unique generalized hexagon of order 2.
CROSSREFS
KEYWORD
nonn,more,hard
AUTHOR
EXTENSIONS
a(11) from B. D. McKay and W. Myrvold.
STATUS
approved