Half the number of nX4 binary arrays with the number of 1-1 horizontal, vertical, diagonal and antidiagonal adjacencies equal to the number of 0-0 adjacencies.
A183285
Half the number of nX4 binary arrays with the number of 1-1 horizontal, vertical, diagonal and antidiagonal adjacencies equal to the number of 0-0 adjacencies.
Terms
- a(0) =2a(1) =18a(2) =180a(3) =2184a(4) =28440a(5) =385316a(6) =5358022a(7) =75912216a(8) =1090973732a(9) =15858156696a(10) =232676544078
External references
- oeis: A183285