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 A117154 Floretion with FAMP code 1teszapsumseq[C*B] with C = - .5'j + .5'k - .5j' + .5k' - 'ii' - .5'ij' - .5'ik' - .5'ji' - .5'ki' and B = - .5'i + .5'j - .5i' + .5j' - 'kk' - .5'ik' - .5'jk' - .5'ki' - .5'kj'. 2
 1, 0, 0, 1, -1, 2, 0, 1, 0, 0, 1, -1, 2, -2, 1, -2, 0, -1, 0, 0, -1, 1, -2, 2, -3, 4, -2, 3, -2, 2, -1, 2, 0, 1, 0, 0, 1, -1, 2, -2, 3, -3, 4, -4, 5, -4, 4, -3, 4, -2, 3, -2, 2, -1, 2, 0, 1, 0, 0, 1, -1, 2, -2, 3, -3, 4, -4, 5, -5, 6, -6, 5, -6, 4, -5, 4, -4, 3, -4, 2, -3, 2, -2 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,6 COMMENTS The following parity property of this sequence seems interesting: Assume 0 is both positive and negative and let sgn(a(n)) be the sign of a(n). Then apparently sgn(a(n)) = -sgn(a(n+1)) = sgn(a(n+2)) for all n. But sgn(a(2n)) != sgn(a(2m)) for all n,m. LINKS Creighton Dement, First 821 terms [after this it alternates 39, -39, 39, -39 forever] Creighton Dement, Notes on A126626 and A117154 Index entries for linear recurrences with constant coefficients, signature (-1). CROSSREFS Sequence in context: A087371 A112762 A145171 * A074941 A171774 A002324 Adjacent sequences:  A117151 A117152 A117153 * A117155 A117156 A117157 KEYWORD sign,easy,hear AUTHOR Creighton Dement, Apr 21 2006 STATUS approved

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