Number of n X n 0..6 symmetric arrays with every row summing to 3*n.
A213798
Number of n X n 0..6 symmetric arrays with every row summing to 3*n.
Terms
- a(0) =1a(1) =7a(2) =153a(3) =23753a(4) =22698959a(5) =138198204339
External references
- oeis: A213798