Number of positive words of length n in the monoid Br_4 of positive braids on 5 strands.

A097551

Number of positive words of length n in the monoid Br_4 of positive braids on 5 strands.

Terms

    a(0) =1a(1) =4a(2) =13a(3) =37a(4) =101a(5) =273a(6) =737a(7) =1990a(8) =5374a(9) =14513a(10) =39194a(11) =105848a(12) =285855a(13) =771985a(14) =2084836a(15) =5630344a(16) =15205404a(17) =41063976a(18) =110898081a(19) =299493268a(20) =808816679a(21) =2184304257a(22) =5898969706a(23) =15930859211a(24) =43023152830a(25) =116189067703

External references