Number of nX2 arrays of occupancy after each element moves to some horizontal, vertical or antidiagonal neighbor, without move-in move-out straight through or left turns.
A221805
Number of nX2 arrays of occupancy after each element moves to some horizontal, vertical or antidiagonal neighbor, without move-in move-out straight through or left turns.
Terms
- a(0) =1a(1) =10a(2) =41a(3) =233a(4) =1156a(5) =6048a(6) =30973a(7) =159968a(8) =823413a(9) =4244066a(10) =21863362a(11) =112652884a(12) =580406183a(13) =2990444375a(14) =15407563307a(15) =79384245250a(16) =409009933399
External references
- oeis: A221805