398125

Appears in sequences

• Number of nonempty subsets of {1,2,...,n} in which exactly 1/4 of the elements are <= (n-4)/2.at n=23A048063
• Maximal number of regions obtained by a straight line drawing of the complete bipartite graph K_{n,n}.at n=35A117717
• Triangle T(n, k) = Product_{j=1..k} Product_{i=0..j-1} ( 1 - (n-k+1)*(3*i-2) ) with T(n, 0) = 1 and T(n, n) = n!, read by rows.at n=19A156730