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 A100285 Expansion of (1+5x^2)/(1-x+x^2-x^3). 2
 1, 1, 5, 5, 1, 1, 5, 5, 1, 1, 5, 5, 1, 1, 5, 5, 1, 1, 5, 5, 1, 1, 5, 5, 1, 1, 5, 5, 1, 1, 5, 5, 1, 1, 5, 5, 1, 1, 5, 5, 1, 1, 5, 5, 1, 1, 5, 5, 1, 1, 5, 5, 1, 1, 5, 5, 1, 1, 5, 5, 1, 1, 5, 5, 1, 1, 5, 5, 1, 1, 5, 5, 1, 1, 5, 5, 1, 1, 5, 5, 1, 1, 5, 5, 1, 1, 5, 5, 1, 1 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 COMMENTS This sequence is periodic. - T. D. Noe, Nov 09 2006 LINKS FORMULA a(n)=a(n-1)-a(n-2)+a(n-3); a(n)=3-2cos(pi*n/2)-2sin(pi*n/2); a(n)=mod(A100284(n), 8). a(n)=1/2*{3*(n mod 4)+[(n+1) mod 4]-[(n+2) mod 4]+[(n+3) mod 4]} - Paolo P. Lava, Nov 21 2006 CROSSREFS Sequence in context: A046585 A046584 A046599 * A172355 A178916 A046568 Adjacent sequences:  A100282 A100283 A100284 * A100286 A100287 A100288 KEYWORD easy,nonn AUTHOR Paul Barry, Nov 11 2004 EXTENSIONS Corrected by T. D. Noe, Nov 09 2006 STATUS approved

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