Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 0,2,1,0,0 for x=0,1,2,3,4.
A198178
Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 0,2,1,0,0 for x=0,1,2,3,4.
Terms
- a(0) =1a(1) =4a(2) =9a(3) =59a(4) =2033a(5) =51688a(6) =4522496a(7) =559601114a(8) =174674654015
External references
- oeis: A198178