login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 56th year, we are closing in on 350,000 sequences, and we’ve crossed 9,700 citations (which often say “discovered thanks to the OEIS”).

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A099435 Number of simple class-1 graphs on n nodes. 2
1, 2, 3, 10, 28, 145, 994, 12215, 273537 (list; graph; refs; listen; history; text; internal format)
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

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified December 1 22:12 EST 2021. Contains 349435 sequences. (Running on oeis4.)