OFFSET
0,1
COMMENTS
LINKS
FORMULA
a(n) = -a(n-3) for n>2; G.f.: (7+5*x+x^2)/((1+x)*(1-x+x^2)). [R. J. Mathar, Jan 23 2009]
a(n) = cos(n*Pi) + 6*cos(n*Pi/3) + 2*sqrt(3)*sin(n*Pi/3). - Wesley Ivan Hurt, Jun 20 2016
MAPLE
A154870:=n->[7, 5, 1, -7, -5, -1][(n mod 6)+1]: seq(A154870(n), n=0..100); # Wesley Ivan Hurt, Jun 20 2016
MATHEMATICA
PadRight[{}, 100, {7, 5, 1, -7, -5, -1}] (* Wesley Ivan Hurt, Jun 20 2016 *)
PROG
(Magma) &cat [[7, 5, 1, -7, -5, -1]^^20]; // Wesley Ivan Hurt, Jun 20 2016
CROSSREFS
KEYWORD
sign,easy
AUTHOR
Paul Curtz, Jan 16 2009
EXTENSIONS
Edited and extended by R. J. Mathar, Jan 23 2009
STATUS
approved