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

A279570

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

Terms

    a(0) =1a(1) =1a(2) =2a(3) =6a(4) =22a(5) =92a(6) =423a(7) =2091a(8) =10950a(9) =60120a(10) =343453a(11) =2029809a(12) =12354661a(13) =77168197a(14) =493189283a(15) =3217459119a(16) =21382723456a(17) =144518555231a(18) =991885282987

External references