ZarankiewiczDB,

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z(21,21) = 105

11111
11111
11111
11111
11111
11111
11111
11111
11111
11111
11111
11111
11111
11111
11111
11111
11111
11111
11111
11111
11111

The unique finite projective plane of order 4; extremal by Reiman's theorem. [Rei58]

weight = 105, submitted on April 22nd, 2016 (link, raw)

Related: Matrix 34, Matrix 191, Matrix 359, Comment 1088, Comment 1089, Bound 1734, Bound 1733, Bound 1732, Bound 1731, Bound 1730, Bound 1729, Bound 1749, Bound 1748, Bound 1747, Bound 1746, Bound 1745, Bound 1744, Bound 1743, Bound 1742, Bound 1741, Bound 1740, Bound 1739, Bound 1738, Bound 1737, Bound 1736, Bound 1735, Bound 1955, Bound 1957, Matrix 2058

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