Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 4,4,0,2,1 for x=0,1,2,3,4.
A197301
Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 4,4,0,2,1 for x=0,1,2,3,4.
Terms
- a(0) =1a(1) =7a(2) =31a(3) =639a(4) =27709a(5) =2533633a(6) =638181656a(7) =388800452625
External references
- oeis: A197301