Number of n X n 0..3 arrays avoiding the patterns z z+1 z or z z-1 z in any row, column or nw-se diagonal.
A207473
Number of n X n 0..3 arrays avoiding the patterns z z+1 z or z z-1 z in any row, column or nw-se diagonal.
Terms
- a(0) =4a(1) =256a(2) =133556a(3) =768149650
External references
- oeis: A207473