Number of length n+2 0..3 arrays with no three elements in a row with pattern aba (with a!=b) and new values 0..3 introduced in 0..3 order.
A243600
Number of length n+2 0..3 arrays with no three elements in a row with pattern aba (with a!=b) and new values 0..3 introduced in 0..3 order.
Terms
- a(0) =4a(1) =10a(2) =28a(3) =85a(4) =269a(5) =870a(6) =2844a(7) =9346a(8) =30792a(9) =101577a(10) =335289a(11) =1107066a(12) =3655876a(13) =12073706a(14) =39875396a(15) =131697309a(16) =434963141a(17) =1436579966a(18) =4744692092a(19) =15670638530a(20) =51756579024a(21) =170940329233a(22) =564577491697
External references
- oeis: A243600