Number of inequivalent self-complementary Seidel matrices of order n.

Terms

a(0) =1a(1) =1a(2) =0a(3) =1a(4) =1a(5) =4a(6) =0a(7) =19a(8) =10a(9) =360a(10) =0a(11) =25112a(12) =720a(13) =6975976a(14) =0a(15) =7030565576a(16) =703760a(18) =0a(20) =9168331776a(22) =0a(26) =0a(30) =0