Number of length n inversion sequences avoiding the patterns 120 and 201.

A374550

Number of length n inversion sequences avoiding the patterns 120 and 201.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =6a(4) =23a(5) =102a(6) =498a(7) =2607a(8) =14386a(9) =82663a(10) =490228a(11) =2981407a(12) =18507513a(13) =116855873a(14) =748427848a(15) =4851982365a(16) =31784721142a(17) =210111119681

External references