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A055453
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a(n) = T(n,n-3), array T as in A055450.
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6
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1, 4, 9, 14, 56, 230, 965, 4120, 17846, 78244, 346605, 1549030, 6976140, 31628838, 144250962, 661352970, 3046379300, 14091723450, 65432979080, 304880016970, 1425043805000, 6680031216850, 31396257423925, 147923222356036
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OFFSET
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3,2
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LINKS
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FORMULA
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a(n) = 14*Hypergeometric2F1([6-n, 9/2], [6], -4), for n >= 6 and a(n) = (n-2)^2 for 3 <= n <= 5. - G. C. Greubel, Jan 30 2024
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MATHEMATICA
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Table[If[n<6, (n-2)^2, 14*Hypergeometric2F1[6-n, 9/2, 6, -4]], {n, 3, 40}] (* G. C. Greubel, Jan 30 2024 *)
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PROG
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(Magma) [n le 6 select (n-2)^2 else Round(14*HypergeometricSeries2F1(6-n, 9/2, 6, -4)): n in [3..40]]; // G. C. Greubel, Jan 30 2024
(SageMath)
def A055453(n): return (n-2)^2 if n<6 else 14*hypergeometric([6-n, 9/2], [6], -4).simplify()
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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