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A100561 Denominator of Sum_{k=0..[n/2]} 1/binomial(n,k). 3

%I

%S 1,1,2,3,12,10,60,105,140,63,280,1155,27720,25740,8008,9009,16380,

%T 17017,6126120,2909907,5542680,2645370,232792560,111546435,535422888,

%U 128707425,2974571600,717084225,80313433200,77636318760,2329089562800,4512611027925,546983154900

%N Denominator of Sum_{k=0..[n/2]} 1/binomial(n,k).

%e 1, 3/2, 4/3, 17/12, 13/10, 77/60, 128/105, 167/140, 73/63, 319/280, 1294/1155, 30697/27720, 28211/25740, 8707/8008, 9728/9009, 17587/16380, 18181/17017, ... = A100560/A100561

%t Denominator[Table[Sum[1/Binomial[n,k],{k,0,Floor[n/2]}],{n,0,40}]] (* _Harvey P. Dale_, Dec 24 2014 *)

%K nonn,frac

%O 0,3

%A _N. J. A. Sloane_, Nov 28 2004

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Last modified January 25 01:39 EST 2020. Contains 331229 sequences. (Running on oeis4.)