$\text{Distance-regular graphs of valency 9}$

No. of verticesGraphIntersection Array
$16$$\text{Complement of }H(2,4)$$\{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\}$
$26$$\text{Incidence graph of }(13,9,3)\text{-design}$$\{9,8,3;1,6,9\}$
$54$$\text{Incidence graph of }\mathrm{STD}_3[9;3]$$\{9,8,6,1;1,3,8,9\}$
$64$$H(3,4)$$\{9,6,3;1,2,3\}$
$146$$\text{Incidence graph of }PG(2,8)$$\{9,8,8;1,1,9\}$
$162$$AG(2,9) \text{ minus a parallel class}$$\{9,8,8,1;1,1,8,9\}$
$256$$\text{Folded 9-cube}$$\{9,8,7,6;1,2,3,4\}$
$280$$\text{Unitals in }PG(2,4) \text{ (from PSL(3,4))}$$\{9,8,6,3;1,1,3,8\}$
$512$$\text{9-cube }Q_9 \cong H(9,2)$$\{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