Number of n X n 0..1 matrices with all row and column sums equal.
A067209
Number of n X n 0..1 matrices with all row and column sums equal.
Terms
- a(0) =1a(1) =2a(2) =4a(3) =14a(4) =140a(5) =4322a(6) =434542a(7) =144109562a(8) =165431317452
External references
- oeis: A067209