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A141519
Period 10: repeat [-1, 1, -3, 7, -5, 3, -7, 9, -9, 5].
0
-1, 1, -3, 7, -5, 3, -7, 9, -9, 5, -1, 1, -3, 7, -5, 3, -7, 9, -9, 5, -1, 1, -3, 7, -5, 3, -7, 9, -9, 5, -1, 1, -3, 7, -5, 3, -7, 9, -9, 5, -1, 1, -3, 7, -5, 3, -7, 9, -9, 5, -1, 1, -3, 7, -5, 3, -7, 9, -9, 5, -1, 1, -3, 7, -5, 3, -7, 9, -9, 5, -1, 1, -3, 7, -5, 3, -7, 9, -9, 5, -1, 1, -3, 7, -5, 3, -7, 9, -9, 5, -1, 1, -3
OFFSET
0,3
COMMENTS
It appears that abs(a(n)) = abs(A001469(n+1)) mod 10.
It also appears that abs(a(n)) = abs(A228767(n+4)) mod 10. - Michel Marcus, Sep 04 2013
FORMULA
G.f.: ( -1-3*x^2+4*x^3+2*x^5-5*x^6-5*x^8-x^4+4*x^7 ) / ( (1+x)*(1+x+x^2+x^3+x^4)*(x^4-x^3+x^2-x+1) ). - R. J. Mathar, Oct 08 2011
a(n) = - Sum_{k=1..9} a(n-k). - Wesley Ivan Hurt, May 27 2021
MATHEMATICA
PadRight[{}, 120, {-1, 1, -3, 7, -5, 3, -7, 9, -9, 5}] (* Harvey P. Dale, Mar 03 2023 *)
CROSSREFS
Sequence in context: A021910 A331632 A094124 * A228000 A029946 A200285
KEYWORD
sign,easy,less
AUTHOR
Paul Curtz, Aug 11 2008
STATUS
approved