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

A279563

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

Terms

    a(0) =1a(1) =1a(2) =2a(3) =6a(4) =22a(5) =85a(6) =328a(7) =1253a(8) =4754a(9) =17994a(10) =68158a(11) =258808a(12) =985906a(13) =3768466a(14) =14451386a(15) =55585014a(16) =214377618a(17) =828795169a(18) =3211030684a(19) =12464308997a(20) =48465092366a(21) =188733879657a(22) =735977084412

External references