Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 2,2,1,1,1 for x=0,1,2,3,4.
A197538
Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 2,2,1,1,1 for x=0,1,2,3,4.
Terms
- a(0) =1a(1) =5a(2) =11a(3) =131a(4) =494a(5) =12019a(6) =223832a(7) =9712913a(8) =396593739a(9) =39500650780
External references
- oeis: A197538