Number of n X 3 arrays of occupancy after each element moves to some horizontal or vertical neighbor, without move-in move-out straight through or left turns.
A221796
Number of n X 3 arrays of occupancy after each element moves to some horizontal or vertical neighbor, without move-in move-out straight through or left turns.
Terms
- a(0) =0a(1) =12a(2) =12a(3) =207a(4) =470a(5) =4073a(6) =13314a(7) =85974a(8) =338148a(9) =1892213a(10) =8198076a(11) =42661873a(12) =194441436a(13) =974764224a(14) =4561903748a(15) =22432271947a(16) =106441266034a(17) =518196714761
External references
- oeis: A221796