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 A117907 Expansion of (1+x+x^2+x^3+x^4+x^5+x^6)/(1+x+x^2+x^3+x^4+x^5). 1
 1, -1, 1, 0, 0, 0, 1, -2, 1, 0, 0, 0, 1, -2, 1, 0, 0, 0, 1, -2, 1, 0, 0, 0, 1, -2, 1, 0, 0, 0, 1, -2, 1, 0, 0, 0, 1, -2, 1, 0, 0, 0, 1, -2, 1, 0, 0, 0, 1, -2, 1, 0, 0, 0, 1, -2, 1, 0, 0, 0, 1, -2, 1 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,8 COMMENTS Diagonal sums of number triangle A117906. LINKS Index entries for linear recurrences with constant coefficients, signature (-1,-1,-1,-1,-1). FORMULA G.f.: x+(1-x)^2/(1-x^6) MATHEMATICA CoefficientList[Series[x+(1-x)^2/(1-x^6), {x, 0, 90}], x] (* or *) Join[{1, -1}, LinearRecurrence[{-1, -1, -1, -1, -1}, {1, 0, 0, 0, 1}, 90]] (* or *) PadRight[ {1, -1}, 90, {1, -2, 1, 0, 0, 0}] (* Harvey P. Dale, Nov 29 2013 *) CROSSREFS Sequence in context: A064662 A024944 A304871 * A300069 A284586 A281244 Adjacent sequences:  A117904 A117905 A117906 * A117908 A117909 A117910 KEYWORD easy,sign AUTHOR Paul Barry, Apr 01 2006 STATUS approved

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Last modified January 28 00:32 EST 2020. Contains 331313 sequences. (Running on oeis4.)