Number of n X n 0..3 arrays avoiding the pattern z z+1 z horizontally and z z-1 z vertically.
A209086
Number of n X n 0..3 arrays avoiding the pattern z z+1 z horizontally and z z-1 z vertically.
Terms
- a(0) =4a(1) =256a(2) =196916a(3) =1971161340
External references
- oeis: A209086