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

A374549

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

Terms

    a(0) =1a(1) =1a(2) =2a(3) =6a(4) =22a(5) =92a(6) =421a(7) =2062a(8) =10646a(9) =57324a(10) =319436a(11) =1831585a(12) =10758458a(13) =64513454a(14) =393846399a(15) =2442328993a(16) =15356020884a(17) =97741913382a(18) =628994116349

External references