49450

Appears in sequences

• a(n) = Sum_{k=1..floor(n/2)} H_k * (n-k)!, where H_k = Sum_{j=1..k} 1/j.at n=8A109719
• a(n) = A192525(n)/2.at n=29A192526
• Number of 2 X 2 matrices having all elements in {0,1,...,n} and determinant in the closed interval [-n,n].at n=23A211031
• a(n) = n*(n + 1)*(n + 2)*(3*n + 17)/24.at n=23A241765
• Number of sets in the geometry determined by the Hausdorff metric at each location between two sets defined by a complete bipartite graph K(3,n) (with n at least 4) missing three edges, where exactly two removed edges are incident to the same vertex in the 3-point set and exactly two removed edges are incident to the same vertex in the other set.at n=3A343372