Near Williamson matrices exist for all odd orders up to 63 with complete lists up to 35, enabling the first quaternary Hadamard matrix of order 118.
Williamson, Hadamard’s determinant theorem and the sum of four squares,Duke Math
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A search for Hadamard matrices of Williamson type
Near Williamson matrices exist for all odd orders up to 63 with complete lists up to 35, enabling the first quaternary Hadamard matrix of order 118.