OFFSET
1,5
LINKS
Index entries for linear recurrences with constant coefficients, signature (1,3,-1,-3,1,1).
FORMULA
a(n)=a(n-1)+3*a(n-2)-a(n-3)-3*a(n-4)+a(n-5)+a(n-6).
G.f.: -x^3/(x^6+x^5-3*x^4-x^3+3*x^2+x-1). [Colin Barker, Nov 23 2012]
EXAMPLE
MATHEMATICA
(See A192780.)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Clark Kimberling, Jul 09 2011
STATUS
approved