Number of n X n 0..2 arrays with row sums 4 and column sums 4.
A172622
Number of n X n 0..2 arrays with row sums 4 and column sums 4.
Terms
- a(0) =0a(1) =1a(2) =21a(3) =2371a(4) =628080a(5) =342829125a(6) =344827336455
External references
- oeis: A172622