Number of length n inversion sequences avoiding the patterns 100, 110, 120, 201, and 210.

A279565

Number of length n inversion sequences avoiding the patterns 100, 110, 120, 201, and 210.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =6a(4) =21a(5) =81a(6) =332a(7) =1420a(8) =6266a(9) =28318a(10) =130412a(11) =609808a(12) =2887582a(13) =13818590a(14) =66726628a(15) =324713196a(16) =1590853485a(17) =7840315329a(18) =38843186366a(19) =193342353214a(20) =966409013021

External references