Equals two maps: number of nX4 binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal, vertical and antidiagonal neighbors in a random 0..3 nX4 array.
A220531
Equals two maps: number of nX4 binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal, vertical and antidiagonal neighbors in a random 0..3 nX4 array.
Terms
- a(0) =4a(1) =107a(2) =2660a(3) =53150a(4) =947486a(5) =15864668a(6) =258344332a(7) =4160105184
External references
- oeis: A220531