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1, 5, 14, 28, 42, 174, 735, 3155, 13726, 60398, 268361, 1202425, 5427110, 24652698, 112622124, 517102008, 2385026330, 11045344150, 51341255630, 239447037890, 1120163788030, 5254987411850, 24716226207075
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OFFSET
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4,2
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LINKS
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FORMULA
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a(n) = 42*Hypergeometric2F1([8-n, 11/2], [7], -4) for n >= 8. - G. C. Greubel, Jan 30 2024
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MATHEMATICA
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Join[{1, 5, 14, 28}, Table[42*Hypergeometric2F1[8-n, 11/2, 7, -4], {n, 8, 40}]] (* G. C. Greubel, Jan 30 2024 *)
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PROG
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(Magma) [1, 5, 14, 28] cat [Floor(42*HypergeometricSeries2F1(8-n, 11/2, 7, -4)): n in [8..40]]; // G. C. Greubel, Jan 30 2024
(SageMath)
def A055454(n): return (1, 5, 14, 28)[n-4] if n<8 else 42*hypergeometric([8-n, 11/2], [7], -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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