Number of nX3 arrays of occupancy after each element moves to some horizontal or vertical neighbor, without move-in move-out left turns.

A221674

Number of nX3 arrays of occupancy after each element moves to some horizontal or vertical neighbor, without move-in move-out left turns.

Terms

    a(0) =2a(1) =27a(2) =400a(3) =5741a(4) =81910a(5) =1165913a(6) =16583044a(7) =235810525a(8) =3352967744a(9) =47674475534a(10) =677859111916

External references