Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 4,0,1,0,1 for x=0,1,2,3,4.
A197665
Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 4,0,1,0,1 for x=0,1,2,3,4.
Terms
- a(0) =1a(1) =9a(2) =95a(3) =5005a(4) =709083a(5) =311676959a(6) =417293944115
External references
- oeis: A197665