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

A279567

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

Terms

    a(0) =1a(1) =1a(2) =2a(3) =6a(4) =21a(5) =82a(6) =343a(7) =1509a(8) =6893a(9) =32419a(10) =156058a(11) =765578a(12) =3815062a(13) =19263736a(14) =98368919a(15) =507197436a(16) =2637242188a(17) =13814247530a(18) =72834238423a(19) =386244387688

External references