Number of length n inversion sequences avoiding the patterns 120, 201, and 210.
A279572
Number of length n inversion sequences avoiding the patterns 120, 201, and 210.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =23a(5) =101a(6) =484a(7) =2468a(8) =13166a(9) =72630a(10) =411076a(11) =2374188a(12) =13938018a(13) =82932254a(14) =499031324a(15) =3031610924a(16) =18568429963a(17) =114541486785a(18) =710973143614
External references
- oeis: A279572