$\text{Brouwer-Haemers Graph}$

Number of vertices:$81$
Diameter:$2$
Intersection array:$\{20,18;1,6\}$
Spectrum:$20^1 2^{60} (-7)^{20}$
Automorphism group:$3^4:2. \text{P} \Gamma \text{L}(2,9)$
Distance-transitive:$\text{Yes}$
Primitive




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Last updated: 19 January 2017