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A227482 The Wiener index of the nanostar dendrimer defined pictorially as NS[n] in the M. Mirzargar reference. 1
4644, 101007, 945783, 6458535, 37636839, 200044647, 1002825063, 4831285095, 22623961959, 103728982887, 467924253543, 2083881950055, 9184570923879, 40135063034727, 174128583269223, 750870085229415, 3220908204874599, 13753353986104167, 58492320032480103, 247884935325539175, 1047202439771446119 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

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

M. Mirzargar, PI, Szeged and edge Szeged polynomials of a dendrimer nanostar, MATCH, Commun. Math. Comput. Chem. 62, 2009, 363-370.

FORMULA

a(n) = -9369 +2^n*74088 +4^n*(50625*n-60075).

G.f.: 27*(172+1849*x+1102*x^2)/((1-x)*(1-2*x)*(1-4*x)^2).

MAPLE

a := proc (n) options operator, arrow: -9369+50625*4^n*n-60075*4^n+74088*2^n end proc: seq(a(n), n = 0 .. 20);

CROSSREFS

Cf. A227483.

Sequence in context: A236815 A233855 A068268 * A028551 A031615 A122713

Adjacent sequences:  A227479 A227480 A227481 * A227483 A227484 A227485

KEYWORD

nonn,easy

AUTHOR

Emeric Deutsch, Jul 13 2013

STATUS

approved

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Last modified May 31 00:29 EDT 2020. Contains 334747 sequences. (Running on oeis4.)