27457584

Appears in sequences

• Denominator of Sum_{i+j+k=n, i,j,k>=1} (i*j)/k.at n=25A076175
• Denominator of sum of all elements M(i,j,k) = i*j/k, (i,j,k = 1..n). a(n) = Denominator[Sum[Sum[Sum[i*j/k,{i,1,n}],{j,1,n}],{k,1,n}]].at n=24A099866
• Denominators of third-order harmonic numbers (defined by Conway and Guy, 1996).at n=23A124838
• Denominator of Sum_{k=1..n} k*H_{n+k} where H_m = Sum_{i=1..m} 1/i.at n=25A144655
• Number of walks within N^2 (the first quadrant of Z^2) starting and ending at (0,0) and consisting of 4 n steps taken from {(-1, -1), (-1, 1), (1, 0)}.at n=6A151332
• 2*A002740(n).at n=13A217213
• a(n) = lcm{1,2,...,n} / binomial(n,floor(n/2)).at n=47A263673
• a(n) is the denominator of the n-th hyperharmonic number of order n.at n=23A354895