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1, 1, 1, 8, 2, 4, 27, 3, 9, 64, 4, 16, 125, 5, 25, 216, 6, 36, 343, 7, 49, 512, 8, 64, 729, 9, 81, 1000, 10, 100, 1331, 11, 121, 1728, 12, 144, 2197, 13, 169, 2744, 14, 196, 3375, 15, 225, 4096, 16, 256, 4913, 17, 289, 5832, 18, 324, 6859, 19, 361, 8000, 20, 400
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OFFSET
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1,4
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LINKS
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Table of n, a(n) for n=1..60.
Index entries for sequences related to linear recurrences with constant coefficients, signature (0,0,4,0,0,-6,0,0,4,0,0,-1).
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FORMULA
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a(n)=4*a(n-3)-6*a(n-6)+4*a(n-9)-a(n-12). G.f.: -(-1-x-x^2-4*x^3+2*x^4-x^6-x^7+x^8)/((x-1)^4*(1+x+x^2)^4). [From R. J. Mathar, Jun 26 2009]
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CROSSREFS
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Cf. A000463.
Sequence in context: A021552 A008830 A217294 * A201583 A179048 A173158
Adjacent sequences: A109611 A109612 A109613 * A109615 A109616 A109617
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KEYWORD
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nonn,easy
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AUTHOR
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Mohammad K. Azarian, Aug 30 2005
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STATUS
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approved
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