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%I #4 Mar 30 2012 18:56:05
%S 1,2,3,4,5,6,10,7,11,12,8,13,9,19,20,21,14,22,23,15,16,17,18,29,30,31,
%T 32,24,38,25,39,26,40,41,27,42,28,48,49,50,33,51,34,35,36,37,57,58,59,
%U 60,61,43,67,44,68,45,69,70,46,47,76,77,78
%N a(n) = (1/2)*s(n), where s = A026262.
%K nonn
%O 1,2
%A _Clark Kimberling_
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