Number of reduced words of length n in Coxeter group on 21 generators S_i with relations (S_i)^2 = (S_i S_j)^3 = I.
A162807
Number of reduced words of length n in Coxeter group on 21 generators S_i with relations (S_i)^2 = (S_i S_j)^3 = I.
Terms
- a(0) =1a(1) =21a(2) =420a(3) =8190a(4) =159600a(5) =3108210a(6) =60532290a(7) =1178845500a(8) =22957618110a(9) =447091673490
External references
- oeis: A162807