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A219609 Half of first differences of A219608. 2

%I

%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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Last modified June 18 20:04 EDT 2021. Contains 345121 sequences. (Running on oeis4.)