Number of n X 4 arrays of occupancy after each element stays put or moves to some horizontal or antidiagonal neighbor, with every occupancy equal to zero or two.

A221415

Number of n X 4 arrays of occupancy after each element stays put or moves to some horizontal or antidiagonal neighbor, with every occupancy equal to zero or two.

Terms

    a(0) =4a(1) =29a(2) =226a(3) =1766a(4) =13794a(5) =107695a(6) =840673a(7) =6561928a(8) =51218473a(9) =399777826a(10) =3120396286a(11) =24355691434a(12) =190103915555

External references