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%I #6 Jul 13 2013 12:04:34
%S 1,2,1,3,2,3,3,1,3,6,3,3,2,3,3,9,3,6,3,3,1,3,6,3,3,18,3,3,9,3,6,3,3,2,
%T 3,3,9,3,6,3,3,33,3,6,3,3,18,3,3,9,3,6,3,3,1,3,6,3,3,18,3,3,9,3,6,3,3,
%U 66,3,3,9,3,6,3,3,33,3,6,3,3,18,3,3,9
%N Half of first differences of A219608.
%C a(n) = (A219608(n+1) - A219608(n)) / 2.
%H Reinhard Zumkeller, <a href="/A219609/b219609.txt">Table of n, a(n) for n = 1..10000</a>
%o (Haskell)
%o a219609 n = a219609_list !! (n-1)
%o a219609_list = map (`div` 2) $ zipWith (-) (tail a219608_list) a219608_list
%K nonn
%O 1,2
%A _Reinhard Zumkeller_, Nov 26 2012
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