The Hajós graph (Brandstädt et al. 1987, Berge 1989) is another name for the Sierpiński sieve graph 
, which is isomorphic to the 2-sun
graph.
However, the term is also sometimes used for the Moser spindle (Bondy and Murty 2008. p. 358).
Hajós Graph
See also
Moser Spindle, Sierpiński Gasket Graph, Sun GraphExplore with Wolfram|Alpha
References
Berge, C. "Minimax Relations for the Partial
-Colorings of a Graph." Disc. Math. 74,
3-14, 1989.Bondy, J. A. and Murty, U. S. R. Graph
Theory. Berlin: Springer-Verlag, 2008.Brandstädt, A.; Le,
V. B.; and Spinrad, J. P. Graph
Classes: A Survey. Philadelphia, PA: SIAM, 1987.Referenced on Wolfram|Alpha
Hajós GraphCite this as:
Weisstein, Eric W. "Hajós Graph." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/HajosGraph.html