1,4

Table of n, a(n) for n=1..9.

Eric Weisstein's World of Mathematics, Class 1 Graph

Gordon Royle, Small Graphs: Class 2 Graphs.

Cf. A099435 (number of simple class-1 graphs on n nodes).

Cf. A099438 (number of connected class-2 graphs on n nodes).

Sequence in context: A154494 A130278 A024080 * A209482 A209341 A077022

Adjacent sequences: A099433 A099434 A099435 * A099437 A099438 A099439

nonn,more

Eric W. Weisstein, Oct 15 2004

More terms from Vladeta Jovovic, Jun 30 2007

Verified up to a(9) by Eric W. Weisstein, Nov 21 2011

approved