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%I #10 Jan 01 2024 08:33:18
%S 1,2,2,1,1,-1,-1,-2,-2,-1,-1,1,1,2,2,1,1,-1,-1,-2,-2,-1,-1,1,1,2,2,1,
%T 1,-1,-1,-2,-2,-1,-1,1,1,2,2,1,1,-1,-1,-2,-2,-1,-1,1,1,2,2,1,1,-1,-1,
%U -2,-2,-1,-1,1,1,2,2,1,1,-1,-1,-2,-2,-1,-1
%N Expansion of (1+2x+x^2-x^3)/(1-x^2+x^4).
%C Hankel transform of A128014, A128015, A005717(n+1).
%H <a href="/index/Rec#order_04">Index entries for linear recurrences with constant coefficients</a>, signature (0,1,0,-1).
%Y Cf. A128016.
%K easy,sign
%O 0,2
%A _Paul Barry_, Feb 11 2007