A099435 Number of simple class-1 graphs on n nodes.

1, 2, 3, 10, 28, 145, 994, 12215, 273537

Offset

1,2

Comments

First six terms look like the Euler transform of A099436, but the 7th isn't. - Vladeta Jovovic, Jun 30 2007; Eric W. Weisstein, Nov 04 2011

Links

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

Eric Weisstein's World of Mathematics, Class 1 Graph

Crossrefs

Cf. A099436 (counts of connected class 1 graphs).

Cf. A099437 (counts of class 2 graphs).

Sequence in context: A216332 A007029 A298083 * A140453 A037169 A058953

Adjacent sequences: A099432 A099433 A099434 * A099436 A099437 A099438

Keyword

nonn

Author

Eric W. Weisstein, Oct 15 2004

Extensions

Corrected and extended by Vladeta Jovovic, Jun 30 2007

"Correction" reverted by Eric W. Weisstein, Nov 04 2011

a(8) from Eric W. Weisstein, Nov 17 2011

a(9) from Eric W. Weisstein, Nov 21 2011

Status

approved