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%I #4 Aug 10 2015 00:29:58
%S 1,1,0,-1,-1,0,0,1,0,-1,0,0,0,-1,0,0,1,0,0,0,0,1,0,0,0,1,0,0,0,0,0,-1,
%T 0,0,0,0,-1,0,0,0,0,0,0,1,0,0,0,0,0,-1
%N Hankel transform of A167751.
%C The nonzero terms appear to be indexed by ceiling((n+1)^2/4) - 0^n (see A004652).
%Y Cf. A167752.
%K sign
%O 0,1
%A _Paul Barry_, Nov 10 2009
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