OFFSET
1,2
LINKS
Index entries for linear recurrences with constant coefficients, signature (3, -2, 1, -1).
FORMULA
a(n)=3*a(n-1)-2*a(n-2)+a(n-3)-a(n-4). G.f.: x*(-1-x^2+x^3)/((1-x)*(x^3+2*x-1)). [From R. J. Mathar, May 25 2009]
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, following a suggestion of Franklin T. Adams-Watters, Apr 20 2006
STATUS
approved