Number of 2nX6 0..3 arrays with values 0..3 introduced in row major order and each element equal to exactly two horizontal and vertical neighbors.
A198599
Number of 2nX6 0..3 arrays with values 0..3 introduced in row major order and each element equal to exactly two horizontal and vertical neighbors.
Terms
- a(0) =2a(1) =32a(2) =674a(3) =14396a(4) =309770a(5) =6671450a(6) =143724590a(7) =3096625676a(8) =66720604082
External references
- oeis: A198599