Number of self-complementary 3-multigraphs on n nodes.

Terms

a(0) =1a(1) =0a(2) =0a(3) =4a(4) =16a(5) =0a(6) =0a(7) =2080a(8) =32896a(9) =0a(10) =0a(11) =178990080a(12) =11453771776a(13) =0a(14) =0a(17) =0a(18) =0a(21) =0a(22) =0