Number of length n+3 0..2 arrays with no four elements in a row with pattern aabb (with a!=b) and new values 0..2 introduced in 0..2 order.
A242578
Number of length n+3 0..2 arrays with no four elements in a row with pattern aabb (with a!=b) and new values 0..2 introduced in 0..2 order.
Terms
- a(0) =13a(1) =35a(2) =97a(3) =271a(4) =757a(5) =2115a(6) =5913a(7) =16535a(8) =46237a(9) =129291a(10) =361537a(11) =1010975a(12) =2827013a(13) =7905235a(14) =22105577a(15) =61814311a(16) =172852717a(17) =483351835a(18) =1351607313a(19) =3779529135a(20) =10568780117a(21) =29553711331a(22) =82641690297a(23) =231092768695a(24) =646209770813
External references
- oeis: A242578