Number of 2n X 2 0..2 arrays with values 0..2 introduced in row major order and each element equal to an even number of horizontal and vertical neighbors.
A198638
Number of 2n X 2 0..2 arrays with values 0..2 introduced in row major order and each element equal to an even number of horizontal and vertical neighbors.
Terms
- a(0) =4a(1) =36a(2) =376a(3) =3936a(4) =41216a(5) =431616a(6) =4519936a(7) =47333376a(8) =495681536a(9) =5190844416a(10) =54359228416a(11) =569257230336
External references
- oeis: A198638