Number of 2nX4 0..2 arrays with values 0..2 introduced in row major order and each element equal to exactly one horizontal or vertical neighbor.
A198529
Number of 2nX4 0..2 arrays with values 0..2 introduced in row major order and each element equal to exactly one horizontal or vertical neighbor.
Terms
- a(0) =12a(1) =206a(2) =3838a(3) =74582a(4) =1481214a(5) =29737425a(6) =600187403a(7) =12144602583a(8) =246046084954
External references
- oeis: A198529