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A078589
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a(1)=0, a(2)=1, a(n) = abs(abs(a(n-1)) - a(n-2) - n + 1).
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1
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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, 57, 14, 72, 28, 75, 15, 93, 44, 84, 4, 117, 75, 81, 34, 88, 12, 119, 63, 101, 8, 140, 84, 105, 29, 127, 46, 134, 34, 155, 65, 147, 24, 182, 98, 145, 15, 193, 114, 144, 36, 175
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OFFSET
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1,4
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COMMENTS
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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, ...
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LINKS
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PROG
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(Python)
A = [0, 1]
for n in range(3, max_n + 1):
A.append(abs(A[-1] - A[-2] - n + 1))
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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