Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 2,0,1,0,0 for x=0,1,2,3,4.
A197530
Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 2,0,1,0,0 for x=0,1,2,3,4.
Terms
- a(0) =1a(1) =9a(2) =56a(3) =1419a(4) =107655a(5) =23325250a(6) =14991391782
External references
- oeis: A197530