Number of length n+3 0..3 arrays with no four elements in a row with pattern abba (with a!=b) and new values 0..3 introduced in 0..3 order.
A243384
Number of length n+3 0..3 arrays with no four elements in a row with pattern abba (with a!=b) and new values 0..3 introduced in 0..3 order.
Terms
- a(0) =14a(1) =45a(2) =158a(3) =579a(4) =2165a(5) =8173a(6) =30991a(7) =117755a(8) =447850a(9) =1704019a(10) =6484899a(11) =24681529a(12) =93941906a(13) =357565151a(14) =1360989974a(15) =5180318659a(16) =19717818240a(17) =75051888869a(18) =285669958665
External references
- oeis: A243384