Order 26

The optimal Gram matrix

For order 26 there is a known D-optimal gram matrix which is unique up to symmetric signed permutations. It is given here in compressed format, and in full here on Will Orrick's website.

Generators for 18 ST-classes

Generators for the 18 known ST-classes are given here. From these generators one can find 5049 HT-classes of maxdet matrices using the operations of row/column switching and taking duals (transposes). This gives 9923 Hadamard equivalence classes of solutions with determinant 150*6^11*2^25.

All 9923 H-classes of solutions

The complete set of all 9923 known Hadamard equivalence classes is available here as a gzipped text file.