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..3 4Xn array.
A221292
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..3 4Xn array.
Terms
- a(0) =1a(1) =37a(2) =556a(3) =9107a(4) =172904a(5) =2890017a(6) =49684593a(7) =821323042a(8) =13475380990
External references
- oeis: A221292