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%I
%S 1,0,-1,-1,-1,0,1,1,0,0,1,1,0,0,0,-1,-1,0,0,0,0,-1,-1,0,0,0,0,0,1,1,0,
%T 0,0,0,0,0,1,1,0,0,0,0,0,0,0,-1,-1,0,0,0,0,0,0,0,0,-1,-1,0,0,0,0,0,0,
%U 0,0,0,1,1,0,0,0,0,0,0,0,0,0,0,1,1,0,0,0,0,0,0,0,0,0,0,0,-1,-1
%N Expansion of 1 / product((1+q^(2*n+3))/(1-q^(2*n+2)), n=0..inf).
%C a(n) = (-1)^n*(t(n)-t(n-1)), n>0, where t(n) = A010054(n) is characteristic function of triangular numbers. - _Vladeta Jovovic_, Sep 22 2002
%D G. E. Andrews, Three-quadrant Ferrers graphs, Indian J. Math., 42 (No. 1, 2000), 1-7.
%Y Cf. A059777.
%K sign
%O 0,1
%A _N. J. A. Sloane_, Feb 21 2001
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