Number of length n+3 0..3 arrays with no four elements in a row with pattern aabb (with a!=b) and new values 0..3 introduced in 0..3 order.
A242579
Number of length n+3 0..3 arrays with no four elements in a row with pattern aabb (with a!=b) and new values 0..3 introduced in 0..3 order.
Terms
- a(0) =14a(1) =45a(2) =159a(3) =587a(4) =2209a(5) =8391a(6) =32020a(7) =122439a(8) =468605a(9) =1794215a(10) =6871124a(11) =26316013a(12) =100792856a(13) =386053397a(14) =1478661408a(15) =5663590035a(16) =21692801897a(17) =83088294355a(18) =318246913929
External references
- oeis: A242579