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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A036673 Number of stereoisomers of all n-node acyclic hydrocarbons with no triple bonds. 1
1, 2, 3, 9, 20, 64, 205, 747, 2767, 14159 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Alternatively, unrooted steric quartic trees allowing single and double edges with n nodes. - Natan Arie' Consigli, Jun 30 2017

LINKS

Table of n, a(n) for n=1..10.

R. C. Read, The Enumeration of Acyclic Chemical Compounds, pp. 25-61 of A. T. Balaban, ed., Chemical Applications of Graph Theory, Ac. Press, 1976. [Annotated scanned copy]  See p. 60.

CROSSREFS

Cf. A000628 (steric quartic trees with no double edges).

Sequence in context: A231368 A245123 A097075 * A111189 A001004 A015951

Adjacent sequences:  A036670 A036671 A036672 * A036674 A036675 A036676

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane

EXTENSIONS

Name clarified by Natan Arie' Consigli, Jun 30 2017

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 February 19 18:31 EST 2018. Contains 299356 sequences. (Running on oeis4.)