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%I #17 Oct 26 2022 03:04:36
%S 0,1,1,3,2,6,2,11,1,19,8,22,2,33,17,31,2,46,26,39,7,53,24,52,4,73,43,
%T 57,14,72,28,75,15,93,44,84,4,117,75,81,34,88,12,119,63,101,8,140,84,
%U 105,29,127,46,134,34,155,65,147,24,182,98,145,15,193,114,144,36,175
%N a(1)=0, a(2)=1, a(n) = abs(abs(a(n-1)) - a(n-2) - n + 1).
%C It seems that lim_{n -> oo} M(n)/n = 3.4... where M(n) = Max(a(k), 1<=k<=n). Does a(n)=1 for a finite number of values? The first ones are 2, 3, 9, 177, 3891, ...
%H John Tyler Rascoe, <a href="/A078589/b078589.txt">Table of n, a(n) for n = 1..10000</a>
%o (Python)
%o def A078589_list(max_n):
%o A = [0,1]
%o for n in range(3,max_n + 1):
%o A.append(abs(A[-1] - A[-2] - n + 1))
%o return(A) # _John Tyler Rascoe_, Oct 25 2022
%K nonn
%O 1,4
%A _Benoit Cloitre_, Dec 06 2002
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