57078

Appears in sequences

• a(n) = a(n-2) + a(n-3) + a(n-4) - a(n-6), with a(0) = a(2) = a(3) = 1, a(1) = 0 and a(4) = a(5) = 2.at n=35A143438
• Triangle read by rows: T(n,k) = (n+1-k)*|s(n,n+1-k)| - 2*|s(n-1,n-k)|, where s(n,k) are the signed Stirling numbers of the first kind and 1 <= k <= n.at n=48A199221
• Numbers m such that phi(m)*tau(m) is a square but phi(m)/tau(m) is not the square of an integer.at n=25A341940
• Number of partitions of n that contain at least one odd prime as a part.at n=43A355193
• a(n) = n! * Sum_{k=0..n} binomial(k+4,5) / k!.at n=7A368576