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0, 7, 76, 747, 4120, 15655, 46692, 117691, 262192, 531495, 1000060, 1771627, 2986056, 4826887, 7529620, 11390715, 16777312, 24137671, 34012332, 47045995, 64000120, 85766247, 113380036, 148036027, 191103120, 244140775, 308915932
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OFFSET
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0,2
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LINKS
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FORMULA
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a(n) = +7*a(n-1) -21*a(n-2) +35*a(n-3) -35*a(n-4) +21*a(n-5) -7*a(n-6) +a(n-7). G.f.: x*(-7-27*x-362*x^2-242*x^3-87*x^4+5*x^5)/(x-1)^7. [From R. J. Mathar, Sep 24 2010]
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MATHEMATICA
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Table[n^6+6n, {n, 0, 30}] (* or *) LinearRecurrence[{7, -21, 35, -35, 21, -7, 1}, {0, 7, 76, 747, 4120, 15655, 46692}, 30] (* Harvey P. Dale, Feb 14 2023 *)
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CROSSREFS
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KEYWORD
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easy,nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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