Number of length n inversion sequences avoiding the patterns 100, 210, 201, and 102.

A279560

Number of length n inversion sequences avoiding the patterns 100, 210, 201, and 102.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =6a(4) =21a(5) =76a(6) =277a(7) =1016a(8) =3756a(9) =13998a(10) =52554a(11) =198568a(12) =754316a(13) =2878552a(14) =11027384a(15) =42384412a(16) =163372325a(17) =631290168a(18) =2444700421a(19) =9485463044a(20) =36866810877a(21) =143508889270a(22) =559399074443

External references