Number of length n+3 0..3 arrays with no four elements in a row with pattern abab (with a!=b) and new values 0..3 introduced in 0..3 order.
A243039
Number of length n+3 0..3 arrays with no four elements in a row with pattern abab (with a!=b) and new values 0..3 introduced in 0..3 order.
Terms
- a(0) =14a(1) =46a(2) =163a(3) =602a(4) =2271a(5) =8655a(6) =33148a(7) =127255a(8) =489084a(9) =1880732a(10) =7234069a(11) =27828644a(12) =107059965a(13) =411883517a(14) =1584628966a(15) =6096542009a(16) =23455294538a(17) =90239951178a(18) =347181934423
External references
- oeis: A243039