Number of length n+2 0..4 arrays with no three elements in a row with pattern aba or abb (with a!=b) and new values 0..4 introduced in 0..4 order.
A243513
Number of length n+2 0..4 arrays with no three elements in a row with pattern aba or abb (with a!=b) and new values 0..4 introduced in 0..4 order.
Terms
- a(0) =3a(1) =5a(2) =10a(3) =24a(4) =65a(5) =187a(6) =552a(7) =1646a(8) =4927a(9) =14769a(10) =44294a(11) =132868a(12) =398589a(13) =1195751a(14) =3587236a(15) =10761690a(16) =32285051a(17) =96855133a(18) =290565378a(19) =871696112a(20) =2615088313a(21) =7845264915a(22) =23535794720a(23) =70607384134a(24) =211822152375a(25) =635466457097
External references
- oeis: A243513