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Expansion of x*(1+2*x)/(1+x+x^2-2*x^3).
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%I #12 Jun 13 2015 00:51:46

%S 0,1,1,-2,3,1,-8,13,-3,-26,55,-35,-72,217,-215,-146,795,-1079,-8,2677,

%T -4827,2134,8047,-19835,16056,19873,-75599,87838,27507,-266543,414712,

%U -93155,-854643,1777222,-1108889,-2377619,7040952,-6881111,-4915079,25878094,-34725237,-983015

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

%C Insert n=3, p=2, q=-1 and r=1 in Kenyon's characteristic polynomial x^n-p*x^(n-1)+q*x+r=0 .

%H Richard Kenyon, <a href="http://arXiv.org/abs/math.MG/9505210">The Construction of Self-Similar Tilings</a>, arXiv:math.MG/9405210

%H <a href="/index/Rec#order_03">Index entries for linear recurrences with constant coefficients</a>, signature (-1,-1,2).

%F a(n) = -a(n-1)-a(n-2)+2*a(n-3) = A077975(n-1)+2*A077975(n-2).

%t LinearRecurrence[{-1,-1,2},{0,1,1},50] (* _Harvey P. Dale_, Jul 23 2013 *)

%Y Cf. A099206.

%K sign,easy

%O 0,4

%A _Roger L. Bagula_, Mar 28 2005

%E Edited, replaced by signed variant by the Assoc. Eds. of the OEIS - Jul 31 2010