Number of 4 X n arrays of occupancy after each element moves to some horizontal or antidiagonal neighbor, with every occupancy equal to zero or two.
A221382
Number of 4 X n arrays of occupancy after each element moves to some horizontal or antidiagonal neighbor, with every occupancy equal to zero or two.
Terms
- a(0) =0a(1) =1a(2) =4a(3) =25a(4) =189a(5) =1156a(6) =6996a(7) =43681a(8) =268632a(9) =1664100a(10) =10278914a(11) =63568729a(12) =392903168a(13) =2429109796
External references
- oeis: A221382