Number of length n inversion sequences avoiding the patterns 120 and 210.

A279573

Number of length n inversion sequences avoiding the patterns 120 and 210.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =6a(4) =23a(5) =102a(6) =499a(7) =2625a(8) =14601a(9) =84847a(10) =510614a(11) =3161964a(12) =20050770a(13) =129718404a(14) =853689031a(15) =5701759424a(16) =38574689104a(17) =263936457042

External references