%I A128054
%S A128054 0,0,1,2,3,5,6,6,7,8,9,11,12,12,13,14,15,17,18,18,19,20,21,23,24,24,25,
%T A128054 26,27,29,30,30,31,32,33,35,36,36,37,38,39,41,42,42,43,44,45,47,48,48,
%U A128054 49,50,51,53,54,54,55,56,57,59,60,60,61,62,63,65,66,66
%N A128054 Count, omitting numbers of the form 6k+4 and doubling multiples of 6.
%F A128054 a(n)=cos(2*pi*n/3)/6-sqrt(3)*sin(2*pi*n/3)/6+cos(pi*n/3)/2-sqrt(3)*sin(pi*n/
               3)/6+(3n-2)/3
%Y A128054 Sequence in context: A165089 A165083 A165085 this_sequence A023834 A084735 
               A002734
%Y A128054 Adjacent sequences: A128051 A128052 A128053 this_sequence A128055 A128056 
               A128057
%K A128054 easy,nonn
%O A128054 0,4
%A A128054 Paul Barry (pbarry(AT)wit.ie), Feb 13 2007