The Non-equivalent Circulant D-Optimal Designs for n=2 mod 4, n<=54, n=66

All non-equivalent circulant D-optimal designs for n ~-2 mod 4, n ~< 54 and n = 66 are given and were found by an exhaustive search. There is a unique non-equivalent circulant design for each value of n ~< 18, 3 for n = 26 and n = 30, 8 for n = 38, 31 for n = 42, 17 for n = 46, 39 for n = 50, 48 for n = 54, and 1025 for n = 66. These are presented in tables in the form of the corresponding non-equivalent supplementary difference sets. Most of the given designs are new.