Number of positive words of length n in the monoid Br_9 of positive braids on 10 strands.

A097556

Number of positive words of length n in the monoid Br_9 of positive braids on 10 strands.

Terms

    a(0) =1a(1) =9a(2) =56a(3) =279a(4) =1223a(5) =4932a(6) =18833a(7) =69345a(8) =249166a(9) =880525a(10) =3076295a(11) =10662459a(12) =36749785a(13) =126161246a(14) =431880044a(15) =1475412473a(16) =5032964258a(17) =17150277106a(18) =58395929325a(19) =198723871661a(20) =675989712225

External references