Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).
%I #10 Jan 09 2021 13:53:07
%S -3,4,-2,5,-1,6,0,7,1,8,2,9,3,10,4,11,5,12,6,13,7,14,8,15,9,16,10,17,
%T 11,18,12,19,13,20,14,21,15,22,16,23,17,24,18,25,19,26,20,27,21,28,22,
%U 29,23,30,24,31,25,32,26,33,27,34,28,35,29,36,30,37,31,38,32,39,33,40,34
%N a(0) = -3; a(n) = n-a(n-1).
%F a(n) = (2n+1-13*(-1)^n)/4. G.f.: -(3-7x+3x^2)/((1+x)(1-x)^2). - _R. J. Mathar_, Jan 08 2009
%t lst={};a=3;Do[a=n-a;AppendTo[lst,a],{n,0,6!}];lst
%t RecurrenceTable[{a[0]==-3,a[n]==n-a[n-1]},a,{n,80}] (* _Harvey P. Dale_, May 16 2016 *)
%Y Cf. A084964, A152832.
%K sign
%O 0,1
%A _Vladimir Joseph Stephan Orlovsky_, Dec 14 2008
%E Indices added to definition, offset corrected by _R. J. Mathar_, Jan 08 2009