Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 2,1,1,0,0 for x=0,1,2,3,4.
A197443
Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 2,1,1,0,0 for x=0,1,2,3,4.
Terms
- a(0) =1a(1) =5a(2) =81a(3) =4837a(4) =1108699a(5) =982926107
External references
- oeis: A197443