187530840

Appears in sequences

• Number of n X n matrices with exactly 2 1's in each row and column, other entries 0.at n=8A001499
• Triangle read by rows: T(n,k) (n >= 0, 0 <= k <= n) gives number of {0,1} n X n matrices with all row and column sums equal to k.at n=38A008300
• Triangle read by rows: T(n,k) (n >= 0, 0 <= k <= n) gives number of {0,1} n X n matrices with all row and column sums equal to k.at n=42A008300
• Number of n X n 0..1 arrays with row sums 6 and column sums 6.at n=7A172544
• Number of 4*n X 8 0..1 arrays with row sums 2 and column sums n.at n=1A172580