Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 4,0,1,1,1 for x=0,1,2,3,4.
A197425
Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 4,0,1,1,1 for x=0,1,2,3,4.
Terms
- a(0) =1a(1) =9a(2) =68a(3) =5197a(4) =720447a(5) =337295264a(6) =529968166606
External references
- oeis: A197425