Number of n X 3 arrays of occupancy after each element moves to some horizontal or vertical neighbor, without 2-loops or left turns.

A221764

Number of n X 3 arrays of occupancy after each element moves to some horizontal or vertical neighbor, without 2-loops or left turns.

Terms

    a(0) =0a(1) =3a(2) =16a(3) =92a(4) =536a(5) =3125a(6) =18216a(7) =106174a(8) =618832a(9) =3606823a(10) =21022112a(11) =122525856a(12) =714133032a(13) =4162272345a(14) =24259501048a(15) =141394733954a(16) =824108902688

External references