Number of 2 X n arrays of occupancy after each element moves to some horizontal or antidiagonal neighbor, without move-in move-out straight through or left turns.
A221756
Number of 2 X n arrays of occupancy after each element moves to some horizontal or antidiagonal neighbor, without move-in move-out straight through or left turns.
Terms
- a(0) =0a(1) =2a(2) =1a(3) =9a(4) =17a(5) =64a(6) =171a(7) =536a(8) =1558a(9) =4689a(10) =13889a(11) =41437a(12) =123228a(13) =366983a(14) =1092232a(15) =3251610a(16) =9679073a(17) =28813033a(18) =85770153a(19) =255320984a(20) =760038643a(21) =2262482568a(22) =6734954798a(23) =20048604913a(24) =59680661697a(25) =177657315701a(26) =528850071604
External references
- oeis: A221756