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A129957
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a(n) = n^3 if n is odd, n^3 + 1 otherwise.
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2
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1, 1, 9, 27, 65, 125, 217, 343, 513, 729, 1001, 1331, 1729, 2197, 2745, 3375, 4097, 4913, 5833, 6859, 8001, 9261, 10649, 12167, 13825, 15625, 17577, 19683, 21953, 24389, 27001, 29791, 32769, 35937, 39305, 42875, 46657, 50653, 54873, 59319
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OFFSET
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0,3
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COMMENTS
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Suggested by a problem in stacking tetrahedra and cubes.
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LINKS
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Table of n, a(n) for n=0..39.
Index to sequences with linear recurrences with constant coefficients, signature (3,-2,-2,3,-1).
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FORMULA
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G.f.: (1-2*x+8*x^2+4*x^3+x^4)/((1-x)^4*(1+x)). [Colin Barker, May 09 2012]
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MATHEMATICA
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f[n_] := If[Mod[n, 2] == 0, n^3 + 1, n^3]; Table[f[n], {n, 0, 30}]
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CROSSREFS
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Sequence in context: A153237 A011923 A029875 * A198956 A110205 A135415
Adjacent sequences: A129954 A129955 A129956 * A129958 A129959 A129960
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KEYWORD
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nonn,easy
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AUTHOR
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Roger L. Bagula, Jun 10 2007
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EXTENSIONS
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Edited, corrected and extended by Stefan Steinerberger, Jul 21 2007
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STATUS
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approved
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