login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo

Thanks to everyone who made a donation during our annual appeal!
To see the list of donors, or make a donation, see the OEIS Foundation home page.

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A224465 The Wiener index of the nanostar dendrimer defined pictorially as NS[n] in the Z. S. Irani reference. 1
8340, 12428, 26748, 76444, 268380, 1100508, 4959708, 23244764, 109587420, 512103388, 2360853468, 10733675484, 48188138460, 213973935068, 941242328028, 4107369456604, 17801289409500, 76697192899548, 328767224423388, 1403004800476124, 5963809931928540 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

REFERENCES

Z. S. Irani, A. Karbasioun, Wiener index of a new type of nanostar dendrimer, Iranian J. Math. Chem., 2, 2011, 79-85.

LINKS

Table of n, a(n) for n=0..20.

FORMULA

a(n) = 9180 + 2^n*(2800*n+136)+4^n*(320*n-976).

G.f.: 4*(2085-23998*z+99736*z^2-177552*z^3+120384*z^4)/((1-z)*(1-2*z)^2*(1-4*z)^2).

MAPLE

a := proc (n) options operator, arrow: 9180+2^n*(2800*n+136)+4^n*(320*n-976) end proc: seq(a(n), n = 0 .. 20);

CROSSREFS

Cf. A224466

Sequence in context: A124414 A124415 A233954 * A031947 A049357 A069402

Adjacent sequences:  A224462 A224463 A224464 * A224466 A224467 A224468

KEYWORD

nonn

AUTHOR

Emeric Deutsch, Jul 12 2013

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 January 18 06:13 EST 2021. Contains 340250 sequences. (Running on oeis4.)