Number of reduced words of length n in Coxeter group on 4 generators S_i with relations (S_i)^2 = (S_i S_j)^6 = I.
A163877
Number of reduced words of length n in Coxeter group on 4 generators S_i with relations (S_i)^2 = (S_i S_j)^6 = I.
Terms
- a(0) =1a(1) =4a(2) =12a(3) =36a(4) =108a(5) =324a(6) =966a(7) =2880a(8) =8592a(9) =25632a(10) =76464a(11) =228096a(12) =680430a(13) =2029788a(14) =6055044a(15) =18062748a(16) =53882820a(17) =160737372a(18) =479494254a(19) =1430375112a(20) =4266939480a(21) =12728669832a(22) =37970783640a(23) =113270312520a(24) =337895678406
External references
- oeis: A163877