555264

Appears in sequences

• Number of permutations of 1..n in which every pair of adjacent numbers are relatively prime.at n=11A076220
• Triangle T(n,k) defined by Sum_{k=1..n} T(n,k)*u^k*x^n/n! = Product_{j>0} (1-x^j)^(-u/j).at n=37A338805
• a(n) = (n!/2) * Sum_{k=1..n-1} d(k)*d(n-k)/(k*(n-k)), where d(n) is the number of divisors of n.at n=8A338810