OFFSET
0,1
COMMENTS
LINKS
Clark Kimberling, Table of n, a(n) for n = 0..2000
Index entries for linear recurrences with constant coefficients, signature (1, 3, -2, -2)
FORMULA
a(n) = a(n-1) + a(n-3) + a(n-4), where a(0) = -2, a(1) = -2, a(2) = 2, a(3) = 1.
G.f.: (-2 + 10 x^2 + x^3)/(1 - x - 3 x^2 + 2 x^3 + 2 x^4).
MATHEMATICA
LinearRecurrence[{1, 3, -2, -2}, {-2, -2, 2, 1}, 100]
CoefficientList[Series[(x^3+10*x^2-2)/(2*x^4+2*x^3-3*x^2-x+1), {x, 0, 40}], x] (* Harvey P. Dale, Mar 05 2018 *)
CROSSREFS
KEYWORD
easy,sign
AUTHOR
Clark Kimberling, Dec 01 2017
STATUS
approved