OFFSET
1,1
LINKS
A. Iranmanesh and N. Gholami, Computing the Szeged index of third and fourth dendrimer nanostars, Micro & Nano Letters, 2 (2007), 107-110.
Index entries for linear recurrences with constant coefficients, signature (13,-64,148,-160,64).
FORMULA
a(n) = 3636*2^n + 1324 + 720*n*4^n + 1560*n*2^n - 1296*4^n.
G.f.: -4*x*(58624*x^4-116832*x^3+81760*x^2-22926*x+2353) / ((x-1)*(2*x-1)^2*(4*x-1)^2). - Colin Barker, Sep 20 2013
MAPLE
a:=3636*2^n+1324+720*n*4^n+1560*n*2^n-1296*4^n: seq(a(n), n=1..18);
MATHEMATICA
LinearRecurrence[{13, -64, 148, -160, 64}, {9412, 30652, 123148, 564844, 2726572}, 30] (* Harvey P. Dale, Aug 20 2019 *)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Emeric Deutsch, Sep 05 2008
EXTENSIONS
More terms from Colin Barker, Sep 20 2013
STATUS
approved