Number of reduced words of length n in Coxeter group on 3 generators S_i with relations (S_i)^2 = (S_i S_j)^4 = I.
A162920
Number of reduced words of length n in Coxeter group on 3 generators S_i with relations (S_i)^2 = (S_i S_j)^4 = I.
Terms
- a(0) =1a(1) =3a(2) =6a(3) =12a(4) =21a(5) =36a(6) =63a(7) =108a(8) =186a(9) =321a(10) =552a(11) =951a(12) =1638a(13) =2820a(14) =4857a(15) =8364a(16) =14403a(17) =24804a(18) =42714a(19) =73557a(20) =126672a(21) =218139a(22) =375654a(23) =646908a(24) =1114029a(25) =1918452a(26) =3303735a(27) =5689308a(28) =9797466a(29) =16872057
External references
- oeis: A162920