Number of nX4 0..3 arrays with values 0..3 introduced in row major order, the number of instances of each value within one of each other, and every element equal to zero or one horizontal or vertical neighbors.
A199353
Number of nX4 0..3 arrays with values 0..3 introduced in row major order, the number of instances of each value within one of each other, and every element equal to zero or one horizontal or vertical neighbors.
Terms
- a(0) =1a(1) =105a(2) =7945a(3) =705263a(4) =66367192a(5) =6518500460a(6) =661357976129
External references
- oeis: A199353