login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A130914 The number of Kekulé structures of the rhombus-shaped benzenoid hydrocarbons. 0
2, 6, 20, 70, 252, 894, 3432, 12870, 48620, 149226 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Here n is the number of aromatic sextets.
REFERENCES
I. Gutman, N. Turkovic and B. Furtula, "On distribution of pi electrons in rhombus-shaped benzenoid hydrocarbons", Indian Journal of Chemistry, Vol. 45A (2006), pp. 1601-1604. See Table 1 on page 1602.
LINKS
EXAMPLE
If n=1 then the number of Kekulé structures of the rhombus-shaped benzenoid hydrocarbons is 2.
If n=2 then the number of Kekulé structures of the rhombus-shaped benzenoid hydrocarbons is 6.
If n=3 then the number of Kekulé structures of the rhombus-shaped benzenoid hydrocarbons is 20.
CROSSREFS
Sequence in context: A360295 A224514 A065345 * A302644 A087944 A056616
KEYWORD
nonn
AUTHOR
Parthasarathy Nambi, Aug 23 2007
STATUS
approved

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified March 19 06:05 EDT 2024. Contains 370952 sequences. (Running on oeis4.)