Number of n X n binary matrices with at most two 1's in each row and column, other entries 0.
A197458
Number of n X n binary matrices with at most two 1's in each row and column, other entries 0.
Terms
- a(0) =1a(1) =2a(2) =16a(3) =265a(4) =7343a(5) =304186a(6) =17525812a(7) =1336221251a(8) =129980132305
External references
- oeis: A197458