Hoffman Singleton Graph

When N=5 and Offset=-2, I think this is the Hoffman Singleton graph. See more at the AMS blog: http://blogs.ams.org/visualinsight/2016/02/01/hoffman-singleton-graph/ The general pattern is N outer N-gons and N inner N-grams (odd;skip 2 stars) and N-gons (even). The segments between inner and outer go by the pattern: j-th vertex of the h-th outer polygon to the h*i+j-th vertex of the ith inner polytope for all values of i. (Whew. See the blog for helpful pictures.)