Number of 2nX2n 0..2 arrays with values 0..2 introduced in row major order and each element unequal to exactly two horizontal and vertical neighbors.
A198446
Number of 2nX2n 0..2 arrays with values 0..2 introduced in row major order and each element unequal to exactly two horizontal and vertical neighbors.
Terms
- a(0) =3a(1) =177a(2) =26704a(3) =13048509a(4) =22496409154
External references
- oeis: A198446