%I A132677
%S A132677 1,2,3,1,2,3,1,2,3,1,2,3,1,2,3,1,2,3,1,2,3,1,2,3,1,2,3,1,2,3,1,2,3,1,2,
%T A132677 3,1,2,3,1,2,3,1,2,3,1,2,3,1,2,3,1,2,3,1,2,3,1,2,3,1,2,3,1,2,3,1,2,3,1,
%U A132677 2,3,1,2,3,1,2,3,1,2,3,1,2,3,1,2,3,1,2,3,1,2,3,1,2,3,1,2,3
%V A132677 1,2,-3,1,2,-3,1,2,-3,1,2,-3,1,2,-3,1,2,-3,1,2,-3,1,2,-3,1,2,-3,1,2,-3,
               1,2,-3,1,2,-3,1,
%W A132677 2,-3,1,2,-3,1,2,-3,1,2,-3,1,2,-3,1,2,-3,1,2,-3,1,2,-3,1,2,-3,1,2,-3,1,
               2,-3,1,2,-3,1,2,
%X A132677 -3,1,2,-3,1,2,-3,1,2,-3,1,2,-3,1,2,-3,1,2,-3,1,2,-3,1,2,-3
%N A132677 Triperiodic or period 3: repeat 1, 2, -3.
%F A132677 Sequence proportional to its 6n-th differences.
%F A132677 a(n)=(1/3)*{-4*(n mod 3)+5*[(n+1) mod 3]-[(n+2) mod 3]} - Paolo P. Lava 
               (ppl(AT)spl.at), Nov 30 2007
%F A132677 G.f.: (1+3*x)/(1+x+x^2) [From Jaume Oliver Lafont (joliverlafont(AT)gmail.com), 
               Mar 24 2009]
%o A132677 (PARI) a(n)=[1,2,-3][1+n%3] [From Jaume Oliver Lafont (joliverlafont(AT)gmail.com), 
               Mar 24 2009]
%Y A132677 Cf. A049347, A000748, A101544.
%Y A132677 Sequence in context: A073645 A082846 A117373 this_sequence A010882 A106590 
               A054073
%Y A132677 Adjacent sequences: A132674 A132675 A132676 this_sequence A132678 A132679 
               A132680
%K A132677 sign
%O A132677 0,2
%A A132677 Paul Curtz (bpcrtz(AT)free.fr), Nov 15 2007