Number of length n+3 0..4 arrays with no four elements in a row with pattern aabb (possibly a=b) and new values 0..4 introduced in 0..4 order.
A242545
Number of length n+3 0..4 arrays with no four elements in a row with pattern aabb (possibly a=b) and new values 0..4 introduced in 0..4 order.
Terms
- a(0) =13a(1) =43a(2) =165a(3) =690a(4) =3050a(5) =13988a(6) =65588a(7) =311431a(8) =1489435a(9) =7152787a(10) =34431086a(11) =165959996a(12) =800539194a(13) =3863197403a(14) =18647303797a(15) =90021133115a(16) =434616726192
External references
- oeis: A242545