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

A221422

Number of 4Xn 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) =0a(1) =16a(2) =150a(3) =1766a(4) =17792a(5) =193809a(6) =2026142a(7) =21225843a(8) =221800513a(9) =2315560756a(10) =24158793461a(11) =251974356335

External references