Equals two maps: number of nX3 binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal, diagonal and antidiagonal neighbors in a random 0..3 nX3 array.
A220957
Equals two maps: number of nX3 binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal, diagonal and antidiagonal neighbors in a random 0..3 nX3 array.
Terms
- a(0) =2a(1) =19a(2) =142a(3) =1224a(4) =9500a(5) =74689a(6) =569829a(7) =4381255a(8) =33461868a(9) =256031511a(10) =1955686977a(11) =14946638627a(12) =114189416236a(13) =872513727055
External references
- oeis: A220957