11085360

Appears in sequences

• a(n) = LCM(1,2,...,n) / n.at n=20A002944
• a(n) = T(2n-1,n), where T is the array defined in A026082.at n=10A026088
• Duplicate of A002944.at n=20A081529
• Denominator of b(n), where Sum_{k>=1} b(k)/k^r = 1/(Sum_{k>=1} H(k)/k^r). H(k) = Sum_{j=1..k} 1/j, the k-th harmonic number.at n=21A097504
• a(n) = (2*n+n^2)*(binomial(2*n,n))/2.at n=10A119581
• Denominator of the polynomial A_i(x) = Sum_{d=1..i-1} x^(i-d)/d for index i=2n+1 evaluated at x=7.at n=9A145622
• Define a sequence of rationals by f(0)=0, thereafter f(n)=f(n-1)-1/n if that is >= 0, otherwise f(n)=f(n-1)+1/n; a(n) = denominator of f(n).at n=21A231693
• Define a sequence of rationals by f(0)=0, thereafter f(n)=f(n-1)-1/n if that is >= 0, otherwise f(n)=f(n-1)+1/n; a(n) = denominator of f(n).at n=22A231693
• a(n) = (2/((n+1)*(n+2)))*multinomial(3*n;n,n,n).at n=7A324151
• Denominator of the product of n and the n-th harmonic alternating number, Sum_{k=1..n} (-1)^(k+1)/k.at n=20A334721
• a(n) is the least positive integer k such that it has exactly n triples of divisors (d1, d2, d3) such that they are pairwise coprime and d1 < d2 < d3 < 2*d1.at n=13A336629