Number of 4Xn arrays of occupancy after each element moves to some horizontal, diagonal or antidiagonal neighbor, without move-in move-out straight through or left turns.
A221820
Number of 4Xn arrays of occupancy after each element moves to some horizontal, diagonal or antidiagonal neighbor, without move-in move-out straight through or left turns.
Terms
- a(0) =0a(1) =40a(2) =379a(3) =29412a(4) =854959a(5) =35948127a(6) =1290833232a(7) =49447514716
External references
- oeis: A221820