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%I
%S 1,-1,3,1,5,3,7,5,9,7,11,9,13,11,15,13,17,15,19,17,21,19,23,21,25,23,
%T 27,25,29,27,31,29,33,31,35,33,37,35,39,37,41,39,43,41,45,43,47,45,49,
%U 47,51,49,53,51,55,53,57,55,59,57,61,59,63,61,65,63,67,65,69,67,71,69,73,71,75,73,77,75,79,77,81,79,83,81,85,83,87,85
%N Interleave 2n+1 and 2n-1.
%C Partial sums are A097063, whose pairwise sums are A002061. Binomial transform is A097064.
%F G.f. : (1-2x+3x^2)/((1-x^2)(1-x)); a(n)=(2n-1)/2+3(-1)^n/2.
%F a(n)=2*(n-1)-a(n-1), (with a(0)=1). [From Vincenzo Librandi, Nov 16 2010]
%e a(1)=2*0-1=-1; a(2)=2*1+1=3; a(3)=2*2-3=1; a(4)=2*3-1=5 [From Librandi, Nov 16 2010]
%K easy,sign
%O 0,3
%A _Paul Barry_, Jul 22 2004
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