Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 4,3,0,1,2 for x=0,1,2,3,4.
A197228
Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 4,3,0,1,2 for x=0,1,2,3,4.
Terms
- a(0) =1a(1) =7a(2) =55a(3) =2117a(4) =249929a(5) =98514881a(6) =126615582841
External references
- oeis: A197228