Number of nX4 0..2 arrays avoiding the pattern z z+1 z in any row or column.
A207217
Number of nX4 0..2 arrays avoiding the pattern z z+1 z in any row or column.
Terms
- a(0) =69a(1) =4761a(2) =247163a(3) =12584703a(4) =647820815a(5) =33403462497
External references
- oeis: A207217