Number of length n inversion sequences avoiding the patterns 102 and 201.

A279566

Number of length n inversion sequences avoiding the patterns 102 and 201.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =6a(4) =22a(5) =87a(6) =354a(7) =1465a(8) =6154a(9) =26223a(10) =113236a(11) =494870a(12) =2185700a(13) =9743281a(14) =43784838a(15) =198156234a(16) =902374498a(17) =4131895035a(18) =19012201080a(19) =87864535600a(20) =407664831856

External references