Equals two maps: number of 4Xn binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal, diagonal and antidiagonal neighbors in a random 0..1 4Xn array.
A220409
Equals two maps: number of 4Xn binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal, diagonal and antidiagonal neighbors in a random 0..1 4Xn array.
Terms
- a(0) =1a(1) =78a(2) =720a(3) =10989a(4) =128448a(5) =1701214a(6) =20736643a(7) =263993960
External references
- oeis: A220409