OFFSET
0,1
LINKS
Matthew House, Table of n, a(n) for n = 0..10000
Index entries for linear recurrences with constant coefficients, signature (0,-1,0,-1).
FORMULA
From Matthew House, Jan 15 2017: (Start)
G.f.: x^2*(1-x)/(1+x^2+x^4).
a(n) = -a(n-2) - a(n-4) for n > 3. (End)
a(n) = sin(n*Pi/6) * (3*sin(n*Pi/2) - 2*sqrt(3)*cos(n*Pi/6) - 3*sqrt(3)*cos(n*Pi/2)) / 3. - Wesley Ivan Hurt, Apr 26 2020
MATHEMATICA
PadRight[{}, 100, {0, 0, 1, -1, -1, 1}] (* Wesley Ivan Hurt, Jan 15 2017 *)
CROSSREFS
KEYWORD
sign,easy
AUTHOR
Paul Curtz, Sep 19 2007
EXTENSIONS
Title edited by Matthew House, Jan 15 2017
STATUS
approved