A286949 Number of perfect disconnected simple graphs on n nodes.

0, 1, 2, 5, 13, 43, 182, 1082, 9979, 147043, 3419289, 119265551

Offset: 1

Author

Eric W. Weisstein, May 17 2017

Keywords

• nonn
• more

Examples

			\bar K_2; (1 graph)
\bar K_3, K_1 \cup K_2; (2 graphs)
\bar K_4, P_2 \cup 2 K_1, P_3 \cup K_1, C_3 \cup K_1, 2P_2 (5 graphs)
Here, \bar indicates a graph complement and \cup a (disjoint) graph union.
		

Links

• Eric Weisstein's World of Mathematics, Disconnected Graph
• Eric Weisstein's World of Mathematics, Perfect Graph

Formula

a(n) = A052431(n) - A052433(n).