Number of 2 X n arrays of occupancy after each element moves to some horizontal, diagonal or antidiagonal neighbor, without move-in move-out straight through or left turns.
A221818
Number of 2 X n arrays of occupancy after each element moves to some horizontal, diagonal or antidiagonal neighbor, without move-in move-out straight through or left turns.
Terms
- a(0) =0a(1) =4a(2) =16a(3) =91a(4) =459a(5) =2429a(6) =12678a(7) =66380a(8) =347305a(9) =1817234a(10) =9509123a(11) =49756006a(12) =260353922a(13) =1362310931a(14) =7128385902a(15) =37299670925a(16) =195172780250
External references
- oeis: A221818