OFFSET
1,2
COMMENTS
Per Haas, a(5) >= 70.
REFERENCES
Batten, Lynn Margaret, and Beutelspacher, Albrecht. The Theory of Finite Linear Spaces: Combinatorics of Points and Lines, Cambridge University Press, 1993.
LINKS
Robert Haas, Cographs, arXiv:1905.12627 [math.GM], 2019, p. 46.
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Michael De Vlieger, Jul 13 2019
STATUS
approved