Number of 2nX2 0..3 arrays with values 0..3 introduced in row major order and each element unequal to exactly two horizontal and vertical neighbors.
A198205
Number of 2nX2 0..3 arrays with values 0..3 introduced in row major order and each element unequal to exactly two horizontal and vertical neighbors.
Terms
- a(0) =4a(1) =43a(2) =658a(3) =11029a(4) =189376a(5) =3272959a(6) =56665678a(7) =981535273a(8) =17003856124a(9) =294580477651
External references
- oeis: A198205