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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A119708 Number of free hexagonal polygons of symmetry class D_(3h) and area n. 0
0, 0, 1, 1, 0, 1, 1, 0, 1, 4, 0, 3, 4, 0, 3, 12, 0, 6, 19, 0, 10, 41, 0, 16, 72, 0, 28, 149, 0, 50, 72, 0, 87, 557, 0 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,10

REFERENCES

Markus Voege, Anthony J. Guttmann and Iwan Jensen, "On the number of benzenoid hydrocarbons", J. Chem. Inf. Comput. Sci., (2002), vol. 42, 456-466.

LINKS

Table of n, a(n) for n=1..35.

CROSSREFS

Cf. A121212, A121211, A121210, A120991.

Sequence in context: A262695 A021252 A195775 * A106142 A092512 A060568

Adjacent sequences:  A119705 A119706 A119707 * A119709 A119710 A119711

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Aug 27 2006

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 May 25 04:36 EDT 2017. Contains 287008 sequences.