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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A122684 Sum of all Wiener indices of "chemical" trees described by A000602(n). 0
0, 1, 4, 19, 54, 155, 432, 1252, 3384, 9714, 26752, 75836, 213058, 603791, 1702868, 4830747, 13666890, 38742120, 109715858, 310884129, 880368618, 2493252951, 7058102770, 19978082407, 56531061316, 159932660960, 452354328946, 1279190479845, 3616595649500 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

C program, see the first Bomfim link, around the function Gen() of Gang Li & Frank Ruskey.

REFERENCES

S. Wagner, Graph-theoretical enumeration and digital expansions: an analytic approach, Dissertation, Fakult. f. Tech. Math. u. Tech. Physik, Tech. Univ. Graz, Austria, Feb., 2006.

LINKS

Table of n, a(n) for n=1..29.

W. Bomfim, C program

Stephan Wagner, On the average Wiener index of degree-restricted trees

CROSSREFS

Sequence in context: A166808 A253008 A186310 * A122681 A215862 A174612

Adjacent sequences:  A122681 A122682 A122683 * A122685 A122686 A122687

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Sep 23 2006

EXTENSIONS

a(11)-a(29) from Washington Bomfim, Feb 24 2011

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 July 22 02:02 EDT 2019. Contains 325210 sequences. (Running on oeis4.)