Number of n X n 0..3 matrices with row and column i=1..n having sum <= i*3.
A213957
Number of n X n 0..3 matrices with row and column i=1..n having sum <= i*3.
Terms
- a(0) =4a(1) =120a(2) =32060a(3) =74323976
External references
- oeis: A213957
A213957
Number of n X n 0..3 matrices with row and column i=1..n having sum <= i*3.