login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A039751 Number of n-node graphs containing a 4-cycle. 0
0, 0, 0, 0, 3, 16, 112, 927, 11995, 273438, 12000099, 1018972683, 165091020547, 50502030251549, 29054155647335623, 31426485969699328399, 64001015704526239877379, 245935864153532913256188013 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,5

REFERENCES

F. Harary and E. M. Palmer, Graphical Enumeration, Academic Press, NY, 1973, p. 228.

LINKS

Table of n, a(n) for n=0..17.

FORMULA

a(n) = A000088(n) - A006786(n). - Falk Hüffner, Nov 27 2015

CROSSREFS

Sequence in context: A141003 A002404 A097142 * A005419 A124537 A305133

Adjacent sequences:  A039748 A039749 A039750 * A039752 A039753 A039754

KEYWORD

nonn,nice,more

AUTHOR

N. J. A. Sloane

EXTENSIONS

Using formula, a(0) and a(6) corrected and more terms added by Falk Hüffner, Nov 27 2015

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 | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified November 12 22:01 EST 2018. Contains 317116 sequences. (Running on oeis4.)