628080

Appears in sequences

• a(n) is the number of n X n matrices of 0's, 1's and -1's in which the entries in each row or column sum to 1.at n=4A050204
• Number of n X n 0..2 arrays with row sums 4 and column sums 4.at n=4A172622
• Number of n X n 0..2 arrays with row sums 6 and column sums 6.at n=4A172627
• Number of 5*n X 5 0..2 arrays with row sums 4 and column sums 4*n.at n=0A172701