ZarankiewiczDB,

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Matrix for z(4,4 | 4,4)

$I$$I$$I$$I$
$I$$\alpha$$\beta$$\alpha\beta$
$I$$\beta$$\alpha\beta$$\alpha$
$I$$\alpha\beta$$\alpha$$\beta$

The quotient matrix for the finite projective plane of order 4. $I$ is the identity, and $\alpha,\beta$ generate $\mathbb{Z}_2 \times \mathbb{Z}_2$.

weight = 64, submitted by Andrew Kay on April 22nd, 2016 (link, raw)