Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 4,2,1,1,1 for x=0,1,2,3,4.
A197606
Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 4,2,1,1,1 for x=0,1,2,3,4.
Terms
- a(0) =1a(1) =5a(2) =67a(3) =3569a(4) =545364a(5) =273369257a(6) =449467029436
External references
- oeis: A197606