Number of 2nX8 0..4 arrays with values 0..4 introduced in row major order and each element equal to exactly two horizontal and vertical neighbors.
A198249
Number of 2nX8 0..4 arrays with values 0..4 introduced in row major order and each element equal to exactly two horizontal and vertical neighbors.
Terms
- a(0) =5a(1) =485a(2) =81440a(3) =14520192a(4) =2606019472a(5) =468268681671
External references
- oeis: A198249