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 A156346 Palindromic period of length 12: repeat 1,2,-4,4,-2,-1,-1,-2,4,-4,2,1. 2
 1, 2, -4, 4, -2, -1, -1, -2, 4, -4, 2, 1, 1, 2, -4, 4, -2, -1, -1, -2, 4, -4, 2, 1, 1, 2, -4, 4, -2, -1, -1, -2, 4, -4, 2, 1, 1, 2, -4, 4, -2, -1, -1, -2, 4, -4, 2, 1 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS Index entries for linear recurrences with constant coefficients, signature (0,0,0,0,0,-1) FORMULA a(n) == A154811(n) (mod 9). a(n) = ( (2*A154811(n)) mod 9 ) - A154811(n). 12*a(n) = [(n+1) mod 12] -6*[(n+2) mod 12] +8*[(n+3) mod 12] -6*[(n+4) mod 12] +[(n+5) mod 12] -[(n+7) mod 12] +6*[(n+8) mod 12] -8*[(n+9) mod 12] +6*[(n+10) mod 12] -[(n+11) mod 12]. [From Paolo P. Lava, Feb 25 2009] G.f. -(x-1)*(x^4+3*x^3-x^2+3*x+1) / ( (1+x^2)*(x^4-x^2+1) ). - R. J. Mathar, Mar 08 2011 MATHEMATICA PadRight[{}, 50, {1, 2, -4, 4, -2, -1, -1, -2, 4, -4, 2, 1}] (* Harvey P. Dale, May 29 2021 *) CROSSREFS Cf. A156283. Sequence in context: A107500 A108620 A070512 * A156283 A126123 A285349 Adjacent sequences:  A156343 A156344 A156345 * A156347 A156348 A156349 KEYWORD easy,sign AUTHOR Paul Curtz, Feb 08 2009 STATUS approved

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Last modified June 16 14:16 EDT 2021. Contains 345057 sequences. (Running on oeis4.)