Number of n X n binary matrices with exactly 3 ones in each row and column, and with rows and columns in lexicographically nondecreasing order.
A229162
Number of n X n binary matrices with exactly 3 ones in each row and column, and with rows and columns in lexicographically nondecreasing order.
Terms
- a(0) =0a(1) =0a(2) =1a(3) =1a(4) =3a(5) =25a(6) =272a(7) =4070a(8) =79221a(9) =1906501
External references
- oeis: A229162