OFFSET
0,1
LINKS
H. Wang and H. Hua, Computing the second- and third- connectivity index of an infinite class of dendrimer nanostars, Digest J. Nanomaterials and Biostructures, 5 (2010) 497-502.
L. Yang and H. Hua, Modified terminal Wiener index of a type of dendrimer nanostars, Optoelectronics and Advanced Materials - Rapid Communications, 5 (2011) 160-163.
FORMULA
a(n) = 627 + 2^n*(936*n+1602)+4^n*(432*n-792).
G.f.: 3*(479-4806*x+17408*x^2-25152*x^3+13952*x^4)/((1-x)*(1-2*x)^2*(1-4*x)^2). - Bruno Berselli, Dec 30 2012
MAPLE
a := proc (n) options operator, arrow: 627+2^n*(936*n+1602)+4^n*(432*n-792) end proc: seq(a(n), n = 0 .. 25);
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Emeric Deutsch, Dec 29 2012
STATUS
approved