15876000

Appears in sequences

• Triangle of number of labeled rooted trees with n nodes and k leaves, n >= 1, 1 <= k <= n.at n=39A055302
• Number of labeled rooted trees with n nodes and 4 leaves.at n=4A055305
• a(n) = (n!)^2/phi(n!), where phi is Euler's totient function.at n=9A123476
• Numbers k such that uphi(k)/phi(k) > uphi(m)/phi(m) for all m < k, where phi(k) is the Euler totient function (A000010) and uphi(k) is the unitary totient function (A047994).at n=34A283052
• Triangle read by rows: T(n,k) (n>=1, 4<=k<=n+3) is the number of k-sequences of balls colored with at most n colors such that exactly three balls are of a color seen previously in the sequence.at n=40A292879
• Triangular array of the number of binary, rooted, leaf-labeled tree topologies with n leaves and k cherries, n >= 2, 1 <= k <= floor(n/2).at n=22A306364
• Largest of the least integers of prime signatures over all partitions of n into distinct parts.at n=14A332644
• Coreful 4-abundant numbers: numbers k such that csigma(k) > 4*k, where csigma(k) is the sum of the coreful divisors of k (A057723).at n=2A340110
• Numbers k such that k and the next three numbers after k with the same prime signature as k also have the same set of distinct prime divisors as k.at n=6A340304
• a(n) = Product_{k=1..w(n)} p(k)^(S(n,k)-1), where set S(n,k) = row n of A272011 and w(n) = A000120(n) is the binary weight of n.at n=30A362227
• Denominator of the greatest probability that a particular free polyomino with n cells appears in the Eden growth model (see A367760).at n=7A367763
• Irregular table T(n,k) = Product_{j = 1..k} prime(j)^(n-j+1), n >= 0, k = 1..n.at n=14A386822
• Irregular triangle T(n,k), n >= 0, 0 <= k < 2^(n-1), where T(n,k) = Product_{j=0..n-1} prime(n-j)^((j+1)*d_j), where d_j is the bit with digit weight 2^j in the binary expansion of 2^(n-1)+k.at n=30A387465
• Numbers of the form P(k)^m * Q(k), m >= 0, with P(k) = Product_{i=1..k} prime(i) = A002110(k) and Q(k) = Product_{j=1..k} P(j) = A006939(k).at n=37A387491
• Numbers of the form P(k)^m * Q(k), k > 1, m >= 0, with P(k) = Product_{i=1..k} prime(i) = A002110(k) and Q(k) = Product_{j=1..k} P(j) = A006939(k).at n=13A387492
• Numbers of the form P(k)^m * Q(k), k > 1, m >= 1, with P(k) = Product_{i=1..k} prime(i) = A002110(k) and Q(k) = Product_{j=1..k} P(j) = A006939(k).at n=10A387493