Number of 2*n X 4 0..2 arrays with row sums 2 and column sums n.
A172660
Number of 2*n X 4 0..2 arrays with row sums 2 and column sums n.
Terms
- a(0) =6a(1) =282a(2) =16260a(3) =1093050a(4) =79796556a(5) =6152037276a(6) =492872166072
External references
- oeis: A172660