Number of reduced words of length n in Coxeter group on 4 generators S_i with relations (S_i)^2 = (S_i S_j)^5 = I.
A163315
Number of reduced words of length n in Coxeter group on 4 generators S_i with relations (S_i)^2 = (S_i S_j)^5 = I.
Terms
- a(0) =1a(1) =4a(2) =12a(3) =36a(4) =108a(5) =318a(6) =936a(7) =2760a(8) =8136a(9) =23976a(10) =70662a(11) =208260a(12) =613788a(13) =1808964a(14) =5331420a(15) =15712878a(16) =46309320a(17) =136483800a(18) =402247944a(19) =1185513624a(20) =3493970742a(21) =10297504260a(22) =30349021740a(23) =89445276900a(24) =263615006412a(25) =776931706398
External references
- oeis: A163315