Number of length n+3 0..2 arrays with no four elements in a row with pattern abba (with a!=b) and new values 0..2 introduced in 0..2 order.
A243383
Number of length n+3 0..2 arrays with no four elements in a row with pattern abba (with a!=b) and new values 0..2 introduced in 0..2 order.
Terms
- a(0) =13a(1) =35a(2) =96a(3) =265a(4) =733a(5) =2029a(6) =5618a(7) =15557a(8) =43081a(9) =119303a(10) =330384a(11) =914929a(12) =2533705a(13) =7016569a(14) =19430930a(15) =53809925a(16) =149015413a(17) =412667243a(18) =1142796240a(19) =3164736889a(20) =8764081669a(21) =24270304357a(22) =67211568290a(23) =186128482181a(24) =515444182609
External references
- oeis: A243383