OFFSET
0,1
COMMENTS
"Cheerleader" sequence: reminiscent of the old cheer, "Two, Four, Six, Eight, Who do we appreciate?"
LINKS
Index entries for linear recurrences with constant coefficients, signature (0,0,0,0,1).
FORMULA
a(n) = 2*((n+1) mod 5).
From R. J. Mathar, Feb 14 2008: (Start)
a(n) = 2*A010874(n+1).
O.g.f.: -2*(1 + 2x + 3x^2 + 4x^3)/((x-1)*(1 + x + x^2 + x^3 + x^4)). (End)
EXAMPLE
a(0) = 2*((0+1) mod 5) = 2*(1 mod 5) = 2.
MATHEMATICA
PadRight[{}, 120, {2, 4, 6, 8, 0}] (* Harvey P. Dale, Nov 21 2018 *)
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
William A. Tedeschi, Feb 10 2008
STATUS
approved