Number of n X 4 arrays of occupancy after each element moves to some horizontal or antidiagonal neighbor, without move-in move-out left turns.
A221605
Number of n X 4 arrays of occupancy after each element moves to some horizontal or antidiagonal neighbor, without move-in move-out left turns.
Terms
- a(0) =4a(1) =53a(2) =811a(3) =12270a(4) =184193a(5) =2764070a(6) =41480899a(7) =622510123a(8) =9342086217a(9) =140197824897
External references
- oeis: A221605