232500

Appears in sequences

• Numbers n such that 10^11 + n^2 is a square.at n=3A180974
• a(n) = - 12*a(n-1) - 54*a(n-2) - 112*a(n-3) - 105*a(n-4) - 36*a(n-5) - 2*a(n-6) with a(0)=a(1)=a(2)=0, a(3)=-3, a(4)=24, a(5)=-135.at n=10A215636
• Number of rooted binary MUL-trees with n leaves on the label set [5].at n=6A220818
• a(n) = lcm(sigma(n), pod(n)) / n, where sigma (k) = the sum of divisors of k (A000203) and pod(n) = the product of divisors of k (A007955).at n=49A307893
• Array read by antidiagonals: T(n,k) is the number of binary rooted trees with n leaves of k colors and all non-leaf nodes having out-degree 2.at n=61A319539