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%I #7 Apr 18 2023 09:34:50
%S 21,1,64,1,20,9,2,6,2,3,2,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,2,2,1,1,1,
%T 1,1,1,1,1,1,1,176,456,110,265,216,595,4,107,433,723,252,75,432,51,
%U 298,2405,780,431,866,78,135,723,29,842,224,5,467,672
%N First differences of A252912.
%H Reinhard Zumkeller, <a href="/A252939/b252939.txt">Table of n, a(n) for n = 1..250</a>
%o (Haskell)
%o a252939 n = a252939_list !! (n-1)
%o a252939_list = zipWith (-) (tail a252912_list) a252912_list
%Y Cf. A252912, A252940 (run lengths).
%K nonn
%O 1,1
%A _Reinhard Zumkeller_, Dec 25 2014
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