Number of reduced words of length n in Coxeter group on 4 generators S_i with relations (S_i)^2 = (S_i S_j)^11 = I.
A166328
Number of reduced words of length n in Coxeter group on 4 generators S_i with relations (S_i)^2 = (S_i S_j)^11 = I.
Terms
- a(0) =1a(1) =4a(2) =12a(3) =36a(4) =108a(5) =324a(6) =972a(7) =2916a(8) =8748a(9) =26244a(10) =78732a(11) =236190a(12) =708552a(13) =2125608a(14) =6376680a(15) =19129608a(16) =57387528a(17) =172158696a(18) =516464424a(19) =1549358280a(20) =4647969864a(21) =13943594664a(22) =41829839238a(23) =125486683524a(24) =376451548188
External references
- oeis: A166328