137352

Appears in sequences

• Number of complementary pairs of graphs on n nodes. Also number of unlabeled graphs with n nodes and an even number of edges.at n=8A007869
• Number of unlabeled graphs with n nodes and an odd sum of nodes and edges.at n=8A137861
• a(n) = A008412(n-1) + A008412(n-2) for n>1, a(0)=0, a(1)=1.at n=31A287324