Number of length n inversion sequences avoiding the patterns 101 and 120.
A374551
Number of length n inversion sequences avoiding the patterns 101 and 120.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =22a(5) =90a(6) =397a(7) =1859a(8) =9145a(9) =46882a(10) =248899a(11) =1361845a(12) =7650233a(13) =43990073a(14) =258287170a(15) =1545382674a(16) =9406108839a(17) =58155261970a(18) =364774287298
External references
- oeis: A374551