14398171200
domain: N
Appears in sequences
- Number of n X n matrices with exactly 2 1's in each row and column, other entries 0.at n=9A001499
- 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=47A008300
- 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=52A008300
- Number of n X n 0..1 arrays with row sums 7 and column sums 7.at n=8A172541
- Number of 9*n X 9 0..1 arrays with row sums 2 and column sums 2*n.at n=0A172617