Distance-regular graphs of valency 9

No. of verticesGraphIntersection Array
16Complement of $H(2,4)$$\{9,4;1,6\}$
20$K_{10,10}-I$$\{9,8,1;1,8,9\}$
20$J(6,3)$$\{9,4,1;1,4,9\}$
26Incidence graph of $(13,9,3)$-design$\{9,8,3;1,6,9\}$
54Incidence graph of $\mathrm{STD}_3[9;3]$$\{9,8,6,1;1,3,8,9\}$
64$H(3,4)$$\{9,6,3;1,2,3\}$
146Incidence graph of $PG(2,8)$$\{9,8,8;1,1,9\}$
162$AG(2,9)$ minus a parallel class$\{9,8,8,1;1,1,8,9\}$
256Folded 9-cube$\{9,8,7,6;1,2,3,4\}$
280Unitals in $PG(2,4)$ (from $\mathrm{PSL}(3,4)$)$\{9,8,6,3;1,1,3,8\}$
5129-cube $Q_9 \cong H(9,2)$$\{9,8,7,6,5,4,3,2,1;1,2,3,4,5,6,7,8,9\}$

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Last updated: 7 June 2017