470288

Appears in sequences

• a_n = - sum_{i=1..n-1} C(i+1, n-i) (-1)^(n-i) a_i.at n=8A028380
• a(n) is the difference between maximal and central squarefree kernel numbers dividing values of {binomial(n,k)} or A001405(n), respectively.at n=21A048682
• Tenth column of (1,5)-Pascal triangle A096940.at n=11A096947
• 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=21A099866
• Denominators of third-order harmonic numbers (defined by Conway and Guy, 1996).at n=20A124838
• Denominator of Sum_{k=1..n} k*H_{n+k} where H_m = Sum_{i=1..m} 1/i.at n=22A144655
• Denominator of sum of reciprocals of numbers less than n that do not divide n.at n=21A281086
• a(n) = floor(n!*(3*floor(n/2)!*ceiling(n/2)! + 3*floor((n+2)/2)!*ceiling((n-2)/2)! - 6*floor(n/2)!*ceiling((n-2)/2)!)^(-1)).at n=21A366109