Number of length n+2 0..4 arrays with no three elements in a row with pattern aba (with a!=b) and new values 0..4 introduced in 0..4 order.
A243601
Number of length n+2 0..4 arrays with no three elements in a row with pattern aba (with a!=b) and new values 0..4 introduced in 0..4 order.
Terms
- a(0) =4a(1) =10a(2) =29a(3) =96a(4) =349a(5) =1350a(6) =5425a(7) =22297a(8) =92841a(9) =389456a(10) =1640630a(11) =6927937a(12) =29294645a(13) =123967625a(14) =524830618a(15) =2222483751a(16) =9412820990a(17) =39869076285a(18) =168877805414a(19) =715352976032
External references
- oeis: A243601