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A152832
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a(0) = -2; a(n) = n - a(n-1) for n > 0.
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13
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-2, 3, -1, 4, 0, 5, 1, 6, 2, 7, 3, 8, 4, 9, 5, 10, 6, 11, 7, 12, 8, 13, 9, 14, 10, 15, 11, 16, 12, 17, 13, 18, 14, 19, 15, 20, 16, 21, 17, 22, 18, 23, 19, 24, 20, 25, 21, 26, 22, 27, 23, 28, 24, 29, 25, 30, 26, 31, 27, 32, 28, 33, 29, 34, 30, 35, 31, 36, 32, 37, 33, 38, 34, 39, 35
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OFFSET
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0,1
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LINKS
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FORMULA
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a(n) = (n+1)/2-(9*(-1)^n+1)/4.
G.f.: -(2*x-1)*(x-2)/((1+x)*(x-1)^2).
a(n) = a(n-1)+a(n-2)-a(n-3). (End)
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MATHEMATICA
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lst={}; a=2; Do[a=n-a; AppendTo[lst, a], {n, 0, 6!}]; lst
RecurrenceTable[{a[0]==-2, a[n]==n-a[n-1]}, a, {n, 80}] (* or *) With[ {nn=40}, Riffle[ Range[-2, nn-2], Range[3, nn+3]]] (* Harvey P. Dale, Jun 02 2019 *)
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CROSSREFS
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KEYWORD
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sign
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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