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A173344 a(n+4) = a(n+3) - 2*a(n+2) - a(n+1) - a(n) 1
0, 1, 0, -2, -3, 0, 8, 13, 0, -34, -55, 0, 144, 233, 0, -610, -987, 0, 2584, 4181, 0, -10946, -17711, 0, 46368, 75025, 0, -196418, -317811, 0, 832040, 1346269, 0, -3524578, -5702887, 0, 14930352, 24157817, 0, -63245986, -102334155, 0 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

COMMENTS

See A173343. A151889 gives a nonnegative version without zeros. (a(n)) = kibseq(X) with X = -0.25'i + 0.5'j + 0.5'k + 0.25'i + j' + 0.5k' - 0.25ii - 0.25'jj' - 0.25'kk' + 0.5'ij' + 0.5'ik' - 0.5'ji' -0.25'jk' + 0.25'kj' + 0.25'ee' (see Munafo link for definitions).

LINKS

Table of n, a(n) for n=0..41.

C. Dement, Online Floretion Multiplier

R. Munafo, Sequences Related to Floretions

Index entries for linear recurrences with constant coefficients, signature (1,-2,-1,-1).

FORMULA

Expansion of (x-x^2)/(x^4+x^3+2*x^2-x+1).

MATHEMATICA

CoefficientList[Series[(x-x^2)/(1-x+2 x^2+x^3+x^4), {x, 0, 50}], x]  (* From Harvey P. Dale, Apr 01 2011 *)

CROSSREFS

Cf. A173343

Sequence in context: A171023 A120473 A019911 * A276994 A020823 A021437

Adjacent sequences:  A173341 A173342 A173343 * A173345 A173346 A173347

KEYWORD

easy,sign

AUTHOR

Creighton Dement, Feb 16 2010

STATUS

approved

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Last modified May 21 00:36 EDT 2022. Contains 353886 sequences. (Running on oeis4.)