Equals two maps: number of nX4 binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal, diagonal and antidiagonal neighbors in a random 0..1 nX4 array.
A220404
Equals two maps: number of nX4 binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal, diagonal and antidiagonal neighbors in a random 0..1 nX4 array.
Terms
- a(0) =4a(1) =40a(2) =908a(3) =10989a(4) =139233a(5) =1782679a(6) =22578152a(7) =286030234a(8) =3627899762
External references
- oeis: A220404