Number of length n inversion sequences avoiding the patterns 101, 102, 201, and 210.

A279561

Number of length n inversion sequences avoiding the patterns 101, 102, 201, and 210.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =6a(4) =21a(5) =77a(6) =287a(7) =1079a(8) =4082a(9) =15522a(10) =59280a(11) =227240a(12) =873886a(13) =3370030a(14) =13027730a(15) =50469890a(16) =195892565a(17) =761615285a(18) =2965576715a(19) =11563073315a(20) =45141073925a(21) =176423482325a(22) =690215089745

External references