OFFSET
0,1
COMMENTS
a(1) has been checked by the direct computation of the Wiener index (using Maple).
REFERENCES
A. R. Ashrafi and P. Nikzad, Kekulé index and bounds of energy for nanostar dendrimers, Digest J. of Nanomaterials and Biostructures, 4, No. 2, 2009, 383-388.
FORMULA
a(n) = -754 + 3768*2^n + 2880n*4^n + 1680n*2^n - 3792*4^n.
G.f.: 2(365 - 744z + 1724z^2 - 2112z^3 + 4160z^4)/((1-z)(1-2z)^2*(1-4z)^2).
MAPLE
a := proc (n) options operator, arrow: 754+1680*2^n*n+2880*4^n*n-3792*4^n+3768*2^n end proc: seq(a(n), n = 0 .. 18);
CROSSREFS
KEYWORD
nonn
AUTHOR
Emeric Deutsch, Apr 06 2013
STATUS
approved