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 A172254 1 followed by period 4: repeat [-1, 3, -2, -1]. 0
 1, -1, 3, -2, -1, -1, 3, -2, -1, -1, 3, -2, -1, -1, 3, -2, -1, -1, 3, -2, -1, -1, 3, -2, -1, -1, 3, -2, -1, -1, 3, -2, -1, -1, 3, -2, -1, -1, 3, -2, -1, -1, 3, -2, -1, -1, 3, -2, -1, -1, 3, -2, -1, -1, 3, -2, -1, -1, 3, -2, -1, -1, 3, -2, -1, -1, 3, -2, -1, -1, 3, -2, -1, -1, 3, -2, -1 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 LINKS Index entries for linear recurrences with constant coefficients, signature (0,0,0,1). FORMULA From Wesley Ivan Hurt, Jul 08 2016: (Start) G.f.: x*(1-x+3*x^2-2*x^3-2*x^4)/(1-x^4). a(n) = a(n-4) for n>5. a(n) = (5*I^(2*n) - 1 - (4-I)*I^(-n) - (4+I)*I^n)/4 for n>1. (End) MAPLE 1, seq(op([-1, 3, -2, -1]), n=1..30); # Wesley Ivan Hurt, Jul 08 2016 MATHEMATICA Join[{1}, PadRight[{}, 100, {-1, 3, -2, -1}]] (* Wesley Ivan Hurt, Jul 08 2016 *) PROG (MAGMA) [1] cat &cat [[-1, 3, -2, -1]^^30]; // Wesley Ivan Hurt, Jul 08 2016 (PARI) Vec(x*(1-x+3*x^2-2*x^3-2*x^4)/(1-x^4) + O(x^99)) \\ Altug Alkan, Jul 08 2016 CROSSREFS Sequence in context: A231820 A010268 A181657 * A053542 A087284 A262311 Adjacent sequences:  A172251 A172252 A172253 * A172255 A172256 A172257 KEYWORD sign,less,easy AUTHOR L. Naing (lnaing.yangon_univ(AT)yahoo.in), Jan 29 2010 EXTENSIONS Edited by Joerg Arndt, Sep 04 2011 STATUS approved

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Last modified November 16 12:40 EST 2018. Contains 317272 sequences. (Running on oeis4.)