Number of n X 2 arrays of occupancy after each element stays put or moves to some horizontal or vertical neighbor, without move-in move-out left turns.
A221769
Number of n X 2 arrays of occupancy after each element stays put or moves to some horizontal or vertical neighbor, without move-in move-out left turns.
Terms
- a(0) =3a(1) =27a(2) =240a(3) =2127a(4) =18828a(5) =166581a(6) =1473549a(7) =13033908a(8) =115285587a(9) =1019699649a(10) =9019211256a(11) =79774585647a(12) =705603080553
External references
- oeis: A221769