Number of n X n binary matrices with zero diagonal and x(i,j)+x(j,k)+x(k,i) not equal to one for i,j,k all different.
A213608
Number of n X n binary matrices with zero diagonal and x(i,j)+x(j,k)+x(k,i) not equal to one for i,j,k all different.
Terms
- a(0) =1a(1) =4a(2) =25a(3) =175a(4) =1572a(5) =19285a(6) =321925a(7) =7695406a(8) =271013005
External references
- oeis: A213608