OFFSET
4,1
LINKS
R. H. Hardin, Table of n, a(n) for n=4..500
Index entries for linear recurrences with constant coefficients, signature (1,0,2,1,0,-1,-1).
FORMULA
G.f.: -x^4*(-13-10*x-17*x^2-4*x^3+7*x^4+12*x^5+8*x^6) / ( 1-x-2*x^3-x^4+x^6+x^7 ). - R. J. Mathar, Jan 19 2011
a(n) = a(n-1)+2*a(n-3)+a(n-4)-a(n-6)-a(n-7). - Wesley Ivan Hurt, May 20 2021
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
R. H. Hardin Aug 14 2009
STATUS
approved