Equals two maps: number of n X n binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal and antidiagonal neighbors in a random 0..3 n X n array.
A221287
Equals two maps: number of n X n binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal and antidiagonal neighbors in a random 0..3 n X n array.
Terms
- a(0) =1a(1) =4a(2) =92a(3) =9107a(4) =4983598a(5) =10344276279
External references
- oeis: A221287