Number of length n+3 0..n arrays with no four elements in a row with pattern abab (with a!=b) and new values 0..n introduced in 0..n order.
A243037
Number of length n+3 0..n arrays with no four elements in a row with pattern abab (with a!=b) and new values 0..n introduced in 0..n order.
Terms
- a(0) =7a(1) =36a(2) =163a(3) =738a(4) =3516a(5) =17919a(6) =97849a(7) =570383a(8) =3532239a(9) =23132758a(10) =159573602a(11) =1155434411a(12) =8755269880a(13) =69244208899a(14) =570254905607
External references
- oeis: A243037