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%I #7 Mar 23 2013 14:12:57
%S 2,2,3,4,5,4,6,7,8,7,8,9,12,10,11,12,13,12,15,16,17,14,16,17,20,19,20,
%T 21,22,19,22,23,26,24,25,26,29,26,27,28,29,28,33,34,35,30,32,33,36,35,
%U 36,37,40,37,40,41,42,39,40,41,46,42,45,46,47,46,49,50,51,46
%N [ n/1 ] - [ (n-1)/2 ] + [ (n-2)/3 ] - ... + ((-1)^n)[ 2/(n-1) ].
%o (PARI) a(n) = sum(i=1, n-1, (-1)^(i+1)*floor((n-i+1)/i)) \\ for n>1 _Michel Marcus_, Mar 22 2013
%K nonn
%O 2,1
%A _Clark Kimberling_
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