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A017102
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a(n) = (8n + 3)^2.
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1
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9, 121, 361, 729, 1225, 1849, 2601, 3481, 4489, 5625, 6889, 8281, 9801, 11449, 13225, 15129, 17161, 19321, 21609, 24025, 26569, 29241, 32041, 34969, 38025, 41209, 44521, 47961, 51529, 55225, 59049, 63001, 67081, 71289, 75625, 80089, 84681
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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(0)=9, a(1)=121, a(2)=361, a(n)=3*a(n-1)-3*a(n-2)+a(n-3). - Harvey P. Dale, Feb 23 2014
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MATHEMATICA
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LinearRecurrence[{3, -3, 1}, {9, 121, 361}, 40] (* Harvey P. Dale, Feb 23 2014 *)
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PROG
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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