Number of length n+3 0..3 arrays with no four elements in a row with pattern aabb (possibly a=b) and new values 0..3 introduced in 0..3 order.
A242544
Number of length n+3 0..3 arrays with no four elements in a row with pattern aabb (possibly a=b) and new values 0..3 introduced in 0..3 order.
Terms
- a(0) =13a(1) =42a(2) =150a(3) =554a(4) =2072a(5) =7808a(6) =29536a(7) =111878a(8) =423969a(9) =1607058a(10) =6092367a(11) =23097242a(12) =87566957a(13) =331989206a(14) =1258663594a(15) =4771951574a(16) =18091832688a(17) =68591328768a(18) =260049450816a(19) =985922294306
External references
- oeis: A242544