Number of reduced words of length n in Coxeter group on 4 generators S_i with relations (S_i)^2 = (S_i S_j)^8 = I.
A164697
Number of reduced words of length n in Coxeter group on 4 generators S_i with relations (S_i)^2 = (S_i S_j)^8 = I.
Terms
- a(0) =1a(1) =4a(2) =12a(3) =36a(4) =108a(5) =324a(6) =972a(7) =2916a(8) =8742a(9) =26208a(10) =78576a(11) =235584a(12) =706320a(13) =2117664a(14) =6349104a(15) =19035648a(16) =57071982a(17) =171111132a(18) =513019140a(19) =1538115228a(20) =4611520836a(21) =13826093148a(22) =41452886916a(23) =124282529820a(24) =372619336494
External references
- oeis: A164697