Number of n X 2 arrays of occupancy after each element stays put or moves to some horizontal, vertical or antidiagonal neighbor, without move-in move-out straight through or left turns.
A221894
Number of n X 2 arrays of occupancy after each element stays put or moves to some horizontal, vertical or antidiagonal neighbor, without move-in move-out straight through or left turns.
Terms
- a(0) =3a(1) =31a(2) =266a(3) =2305a(4) =19936a(5) =172624a(6) =1494152a(7) =12933821a(8) =111957318a(9) =969123166a(10) =8388906524a(11) =72615905296a(12) =628576515760
External references
- oeis: A221894