Number of length n inversion sequences avoiding the patterns 100 and 102.

A374554

Number of length n inversion sequences avoiding the patterns 100 and 102.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =6a(4) =21a(5) =80a(6) =318a(7) =1305a(8) =5487a(9) =23535a(10) =102603a(11) =453400a(12) =2026408a(13) =9144361a(14) =41607161a(15) =190675552a(16) =879318056a(17) =4077566276a(18) =19001732690a(19) =88940105945a(20) =417948841012

External references