Number of length n+3 0..n arrays with no four elements in a row with pattern abba (with a!=b) and new values 0..n introduced in 0..n order.

A243382

Number of length n+3 0..n arrays with no four elements in a row with pattern abba (with a!=b) and new values 0..n introduced in 0..n order.

Terms

    a(0) =7a(1) =35a(2) =158a(3) =715a(4) =3406a(5) =17366a(6) =94907a(7) =553807a(8) =3433490a(9) =22512257a(10) =155472029a(11) =1126989053a(12) =8548807676a(13) =67679513141a(14) =557899676487

External references