Equals two maps: number of 4Xn binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal and antidiagonal neighbors in a random 0..2 4Xn array.
A220938
Equals two maps: number of 4Xn binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal and antidiagonal neighbors in a random 0..2 4Xn array.
Terms
- a(0) =1a(1) =37a(2) =556a(3) =9107a(4) =172904a(5) =2876430a(6) =49406891
External references
- oeis: A220938