Number of length n+3 0..2 arrays with no four elements in a row with pattern abab (with a!=b) and new values 0..2 introduced in 0..2 order.
A243038
Number of length n+3 0..2 arrays with no four elements in a row with pattern abab (with a!=b) and new values 0..2 introduced in 0..2 order.
Terms
- a(0) =13a(1) =36a(2) =101a(3) =285a(4) =806a(5) =2281a(6) =6457a(7) =18280a(8) =51753a(9) =146521a(10) =414826a(11) =1174445a(12) =3325061a(13) =9413836a(14) =26652237a(15) =75457205a(16) =213632718a(17) =604832081a(18) =1712386801a(19) =4848070480a(20) =13725746641a(21) =38860021041a(22) =110019605842a(23) =311485000405a(24) =881869233533
External references
- oeis: A243038