OFFSET
8,1
LINKS
Colin Barker, Table of n, a(n) for n = 8..1000
Index entries for linear recurrences with constant coefficients, signature (1,0,0,0,0,0,1,0,-1,0,0,0,0,0,-1,1).
FORMULA
G.f.: 6*x^8/((1-x)^2*(1-x^7))+12*x^9/((1-x)^2*(1-x^8)).
MATHEMATICA
DeleteCases[#, 0] &@ CoefficientList[Series[6 x^8/((1 - x)^2 (1 - x^7)) + 12 x^9/((1 - x)^2 (1 - x^8)), {x, 0, 49}], x] (* Michael De Vlieger, Jan 10 2017 *)
PROG
(PARI) Vec(6*x^8*(1 +3*x +3*x^2 +3*x^3 +3*x^4 +3*x^5 +3*x^6 +3*x^7) / ((1 -x)^3*(1 +x)*(1 +x^2)*(1 +x^4)*(1 +x +x^2 +x^3 +x^4 +x^5 +x^6)) + O(x^60)) \\ Colin Barker, Jan 10 2017
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
David S. Newman, Dec 10 2005
EXTENSIONS
Edited by Colin Barker, Jan 10 2017
a(11) corrected by Colin Barker, Jan 10 2017
STATUS
approved