Number of n X n binary matrices with floor(n^2/2) 1's and rows and columns in lexicographically nondecreasing order.
A180978
Number of n X n binary matrices with floor(n^2/2) 1's and rows and columns in lexicographically nondecreasing order.
Terms
- a(0) =1a(1) =3a(2) =10a(3) =121a(4) =3680a(5) =326650a(6) =91271990a(7) =74872992399
External references
- oeis: A180978