15858432

Appears in sequences

• Number of (binary) bit strings of length n in which an odd length block of 0's is followed by an odd length block of 1's.at n=22A065495
• Triangular array of A(n,k) for n>=1 and 0<=k<=n^2 equal the number of permutations of the set {1,2,...,n}^2 such that first coordinates of first k elements are nondecreasing and second coordinates of the remaining n^2-k elements are nondecreasing.at n=25A261602
• Number of permutations of the set {1,2,...,n}^2 such that first coordinates of first floor(n^2/2) elements are nondecreasing and second coordinates of the remaining ceiling(n^2/2) elements are nondecreasing.at n=3A261603