83423830027domain: NAppears in sequencesa(n) = (1/C(n,0) + 1/C(n,1) + ... + 1/C(n,k))*L, where k = [ n/2 ], L = LCM{C(n,0), C(n,1),..., C(n,n)}.at n=28A025534Numerator of Sum_{k=0..[n/2]} 1/binomial(n,k).at n=28A100560