Number of nX4 0..2 arrays with every 0 next to a 1 and every 1 next to a 2 horizontally, vertically or antidiagonally.
A232305
Number of nX4 0..2 arrays with every 0 next to a 1 and every 1 next to a 2 horizontally, vertically or antidiagonally.
Terms
- a(0) =15a(1) =1915a(2) =107047a(3) =6363511a(4) =382995685a(5) =22952606015
External references
- oeis: A232305