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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A345248 Number of labeled connected simple graphs on n vertices without cycles of length 4. 1
1, 1, 4, 28, 302, 4776, 106732, 3249352, 131290812, 6922560160, 470586936176, 40833342324864, 4482709905772936, 617622136930640128, 106013904370382120400, 22516967955697072408576, 5880701545642715236590608, 1877504184190590494772860928 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Table of n, a(n) for n=1..18.

CROSSREFS

LOG transform of A345249.

A077269 counts isomorphism classes.

Cf. A345218.

Sequence in context: A343709 A274043 A007152 * A295258 A177554 A316212

Adjacent sequences:  A345245 A345246 A345247 * A345249 A345250 A345252

KEYWORD

nonn,hard

AUTHOR

Brendan McKay, Jun 12 2021

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 October 19 09:31 EDT 2021. Contains 348074 sequences. (Running on oeis4.)