Number of n X n 0..1 symmetric arrays with every row summing to floor(n/2).
A213793
Number of n X n 0..1 symmetric arrays with every row summing to floor(n/2).
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =18a(5) =112a(6) =1760a(7) =35150a(8) =1944530a(9) =133948836a(10) =26615510712
External references
- oeis: A213793