Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 4,3,2,1,2 for x=0,1,2,3,4.
A197236
Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 4,3,2,1,2 for x=0,1,2,3,4.
Terms
- a(0) =1a(1) =2a(2) =15a(3) =231a(4) =10649a(5) =1209990a(6) =352842084a(7) =271939715540
External references
- oeis: A197236