%I #4 Jan 20 2014 22:19:36
%S 1,-1,1,-1,1,-1,5,-691,7,-3617,43867,-174611,854513
%N Variant of A176546 with the sign of the second term switched.
%C Essentially the same as A000367. Also the nonzero entries of A027641.
%F a(n)=A176546(n), n>1.
%Y Cf. A027641.
%K sign,frac,easy,less
%O 0,7
%A _Paul Curtz_, Apr 27 2010