%I A141577
%S A141577 1,0,1,1,3,3,8,9,21,27,55,80,143,235,369,685,944,1983,2391,5705,5985,16320,
%T A141577 14769,46441,35803,131507,84824,370665,194813,1040147,427767,2906448,874495,
%U A141577 8088003,1564377,22416669,1971296,61883839,1016657,170165393,20507391,
               466069760
%V A141577 -1,0,1,-1,-3,3,8,-9,-21,27,55,-80,-143,235,369,-685,-944,1983,2391,-5705,
               -5985,16320,
%W A141577 14769,-46441,-35803,131507,84824,-370665,-194813,1040147,427767,-2906448,
               -874495,
%X A141577 8088003,1564377,-22416669,-1971296,61883839,-1016657,-170165393,20507391,
               466069760
%N A141577 Alternating difference recursion: a(0) = -1; a(1) = 0; a(2) = 1; a(3) 
               = -1; a(n)=a(n-1)-3*a(n-2)+3*a(n-3)-a(n-4).
%D A141577 Martin Gardner, Mathematical Circus,Randon House, New York, 1981, p. 
               165
%D A141577 http://math.fullerton.edu/mathews/software/Matlab2004.zip
%F A141577 O.g.f.: (-1+x-2x^2+x^3)/(1-x+3x^2-3x^3+x^4). - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), 
               Aug 25 2008
%Y A141577 Sequence in context: A022663 A092481 A099508 this_sequence A123315 A052407 
               A105039
%Y A141577 Adjacent sequences: A141574 A141575 A141576 this_sequence A141578 A141579 
               A141580
%K A141577 sign
%O A141577 0,5
%A A141577 Matt Wynne (mattwyn(AT)verizon.net), Aug 18 2008
%E A141577 Corrected and extended by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), 
               Aug 25 2008