OFFSET
0,2
LINKS
Muniru A Asiru, Table of n, a(n) for n = 0..500
Index entries for linear recurrences with constant coefficients, signature (6,-6,-16,12,24,8).
FORMULA
MATHEMATICA
CoefficientList[Series[1/(1-2x(1+x))^3, {x, 0, 25}], x] (* Harvey P. Dale, Mar 14 2011 *)
PROG
(Sage) taylor( 1/(1-2*x-2*x^2)^3, x, 0, 25).list() # Zerinvary Lajos, Jun 03 2009; modified by G. C. Greubel, Oct 03 2022
(GAP) List([0..25], n->2^n*Sum([0..Int(n/2)], k->Binomial(n-k+2, 2)*Binomial(n-k, k)*(1/2)^k)); # Muniru A Asiru, Jun 12 2018
(Magma) R<x>:=PowerSeriesRing(Integers(), 30); Coefficients(R!( 1/(1-2*x-2*x^2)^3 )); // G. C. Greubel, Oct 03 2022
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Wolfdieter Lang, Aug 02 2002
STATUS
approved