%I A010675
%S A010675 0,4,0,4,0,4,0,4,0,4,0,4,0,4,0,4,0,4,0,4,0,4,0,4,0,4,0,
%T A010675 4,0,4,0,4,0,4,0,4,0,4,0,4,0,4,0,4,0,4,0,4,0,4,0,4,0,4,
%U A010675 0,4,0,4,0,4,0,4,0,4,0,4,0,4,0,4,0,4,0,4,0,4,0,4,0,4,0
%N A010675 Period 2.
%F A010675 a(n)=2*[1-(-1)^n], a(n)=4*(n mod 2) - Paolo P. Lava (ppl(AT)spl.at), 
               Oct 20 2006
%F A010675 O.g.f.: -2/(1+x)-2/(x-1) . - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), 
               Feb 19 2008
%Y A010675 Sequence in context: A147986 A147988 A019920 this_sequence A035673 A035638 
               A098002
%Y A010675 Adjacent sequences: A010672 A010673 A010674 this_sequence A010676 A010677 
               A010678
%K A010675 nonn
%O A010675 0,2
%A A010675 N. J. A. Sloane (njas(AT)research.att.com).