Number of length n+2 0..8 arrays with no three equal elements in a row and new values 0..8 introduced in 0..8 order.
A242471
Number of length n+2 0..8 arrays with no three equal elements in a row and new values 0..8 introduced in 0..8 order.
Terms
- a(0) =4a(1) =12a(2) =41a(3) =159a(4) =685a(5) =3233a(6) =16534a(7) =90862a(8) =532958a(9) =3317613a(10) =21803646a(11) =150528288a(12) =1086089333a(13) =8146481406a(14) =63182485967a(15) =504037166445
External references
- oeis: A242471