Number of 2 X n arrays of occupancy after each element moves to some horizontal, vertical or antidiagonal neighbor, without 2-loops or left turns.
A221829
Number of 2 X n arrays of occupancy after each element moves to some horizontal, vertical or antidiagonal neighbor, without 2-loops or left turns.
Terms
- a(0) =0a(1) =3a(2) =16a(3) =73a(4) =333a(5) =1519a(6) =6929a(7) =31607a(8) =144177a(9) =657671a(10) =3000001a(11) =13684663a(12) =62423313a(13) =284747239a(14) =1298889569a(15) =5924953367a(16) =27026987697a(17) =123285031751a(18) =562371183361
External references
- oeis: A221829