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A046826
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Denominator of Sum_{k=0..n} 1/binomial(n,k).
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5
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1, 1, 2, 3, 3, 5, 60, 105, 35, 63, 630, 1155, 6930, 12870, 24024, 9009, 9009, 17017, 306306, 2909907, 692835, 1322685, 58198140, 111546435, 66927861, 128707425, 371821450, 717084225, 20078358300, 38818159380, 2329089562800, 4512611027925
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OFFSET
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0,3
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REFERENCES
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See A046825, which is the main entry.
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LINKS
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FORMULA
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EXAMPLE
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1, 2, 5/2, 8/3, 8/3, 13/5, 151/60, 256/105, 83/35, 146/63, 1433/630, 2588/1155, 15341/6930, 28211/12870, 52235/24024, 19456/9009, 19345/9009, ... = A046825/A046826
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MATHEMATICA
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Denominator[Table[Sum[1/Binomial[n, k], {k, 0, n}], {n, 0, 40}]] (* Harvey P. Dale, Nov 05 2011 *)
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PROG
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(Magma) [Denominator((&+[1/Binomial(n, j): j in [0..n]])): n in [0..40]]; // G. C. Greubel, May 24 2021
(Sage) [denominator(sum(1/binomial(n, j) for j in (0..n))) for n in (0..40)] # G. C. Greubel, May 24 2021
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CROSSREFS
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KEYWORD
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nonn,easy,frac,nice
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AUTHOR
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STATUS
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approved
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