Number of reduced words of length n in Coxeter group on 3 generators S_i with relations (S_i)^2 = (S_i S_j)^6 = I.

A163876

Number of reduced words of length n in Coxeter group on 3 generators S_i with relations (S_i)^2 = (S_i S_j)^6 = I.

Terms

    a(0) =1a(1) =3a(2) =6a(3) =12a(4) =24a(5) =48a(6) =93a(7) =180a(8) =351a(9) =684a(10) =1332a(11) =2592a(12) =5046a(13) =9825a(14) =19128a(15) =37239a(16) =72498a(17) =141144a(18) =274788a(19) =534972a(20) =1041513a(21) =2027676a(22) =3947595a(23) =7685400a(24) =14962368a(25) =29129580a(26) =56711106a(27) =110408373a(28) =214949232a(29) =418475259

External references