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 (1,1,1,-2).
FORMULA
G.f.: -x^4*(-13-8*x+x^2+16*x^3) / ( (x-1)*(2*x^3+x^2-1) ). - R. J. Mathar, Jan 19 2011
MATHEMATICA
LinearRecurrence[{1, 1, 1, -2}, {13, 21, 33, 51}, 40] (* Harvey P. Dale, Dec 12 2017 *)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
R. H. Hardin, Aug 14 2009
STATUS
approved