Number of positive words of length n in the monoid Br_7 of positive braids on 8 strands.

A097554

Number of positive words of length n in the monoid Br_7 of positive braids on 8 strands.

Terms

    a(0) =1a(1) =7a(2) =36a(3) =151a(4) =570a(5) =2019a(6) =6893a(7) =23034a(8) =76020a(9) =249077a(10) =812614a(11) =2644447a(12) =8592693a(13) =27895296a(14) =90510106a(15) =293576779a(16) =952053411a(17) =3087093728a(18) =10009389358a(19) =32452403488a(20) =105214363653a(21) =341111617862

External references