Number of unlabeled Euler graphs with n nodes; number of unlabeled two-graphs with n nodes; number of unlabeled switching classes of graphs with n nodes; number of switching classes of unlabeled signed complete graphs on n nodes; number of Seidel matrices of order n.
A002854
Number of unlabeled Euler graphs with n nodes; number of unlabeled two-graphs with n nodes; number of unlabeled switching classes of graphs with n nodes; number of switching classes of unlabeled signed complete graphs on n nodes; number of Seidel matrices of order n.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =3a(4) =7a(5) =16a(6) =54a(7) =243a(8) =2038a(9) =33120a(10) =1182004a(11) =87723296a(12) =12886193064
External references
- oeis: A002854