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!)
A125672 Classification of bicyclics with the parameter 'alpha' having the value of 3. See the paper by Hendrickson and Parks for details. 1
1, 3, 11, 35, 113, 351, 1093, 3348, 10218, 30906, 93005 (list; graph; refs; listen; history; text; internal format)
OFFSET

5,2

COMMENTS

Here 'alpha' is the number of atoms the two rings have in common.

REFERENCES

James B. Hendrickson and Camden A. Parks, "Generation and Enumeration of Carbon Skeletons", J. Chem. Inf. Comput. Sci., vol. 31 (1991), pp. 101-107. See Table VII column 5 on page 104.

LINKS

Table of n, a(n) for n=5..15.

EXAMPLE

If n=5 then the number of bicyclics when 'alpha' = three is 1.

If n=6 then the number of bicyclics when 'alpha' = three is 3.

If n=7 then the number of bicyclics when 'alpha' = three is 11.

If n=8 then the number of bicyclics when 'alpha' = three is 35.

CROSSREFS

Cf. A121330, A121331, A121332, A121333, A125064.

Sequence in context: A109196 A032637 A034576 * A107683 A259400 A320087

Adjacent sequences:  A125669 A125670 A125671 * A125673 A125674 A125675

KEYWORD

nonn

AUTHOR

Parthasarathy Nambi, Jan 29 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 | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified February 25 08:05 EST 2020. Contains 332221 sequences. (Running on oeis4.)