Number of 3*n X 9 0..1 arrays with row sums 3 and column sums n.
A172568
Number of 3*n X 9 0..1 arrays with row sums 3 and column sums n.
Terms
- a(0) =1680a(1) =90291600
External references
- oeis: A172568
A172568
Number of 3*n X 9 0..1 arrays with row sums 3 and column sums n.