413508

Appears in sequences

• Number of series-reduced locally non-intersecting aperiodic rooted trees with n nodes.at n=24A319271
• Number of k <= P(n) such that gcd(k,P(n)) > 1, yet there is a prime q | k that does not divide P(n), where P(n) = A002110(n).at n=7A363844
• a(n) = Sum_{i+j+k+m=n, i,j,k,m >= 1} tau(i) * tau(j) * tau(k) * tau(m).at n=34A375002