Number of length n inversion sequences avoiding the patterns 110, 210, 120, 201, and 010.

A279553

Number of length n inversion sequences avoiding the patterns 110, 210, 120, 201, and 010.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =5a(4) =15a(5) =50a(6) =178a(7) =663a(8) =2552a(9) =10071a(10) =40528a(11) =165682a(12) =686151a(13) =2872576a(14) =12137278a(15) =51690255a(16) =221657999a(17) =956265050a(18) =4147533262a(19) =18074429421a(20) =79102157060a(21) =347519074010

External references