133948836

Appears in sequences

• Number of n X n symmetric binary matrices with all row sums 4.at n=5A139670
• Number of n X n symmetric binary matrices with all row sums 5.at n=4A139671
• Number of n X n 0..1 symmetric arrays with every row summing to floor(n/2).at n=9A213793
• T(n,k)=Number of n X n 0..k symmetric arrays with every row summing to floor(n*k/2).at n=44A213800
• Triangle read by rows: T(n,k) is the number of n X n symmetric binary matrices with k ones in every row and column.at n=49A333157
• Triangle read by rows: T(n,k) is the number of n X n symmetric binary matrices with k ones in every row and column.at n=50A333157