Number of reduced words of length n in Coxeter group on 3 generators S_i with relations (S_i)^2 = (S_i S_j)^7 = I.

A164352

Number of reduced words of length n in Coxeter group on 3 generators S_i with relations (S_i)^2 = (S_i S_j)^7 = I.

Terms

    a(0) =1a(1) =3a(2) =6a(3) =12a(4) =24a(5) =48a(6) =96a(7) =189a(8) =372a(9) =735a(10) =1452a(11) =2868a(12) =5664a(13) =11184a(14) =22086a(15) =43617a(16) =86136a(17) =170103a(18) =335922a(19) =663384a(20) =1310064a(21) =2587140a(22) =5109132a(23) =10089609a(24) =19925148a(25) =39348555a(26) =77706264a(27) =153455784a(28) =303047352a(29) =598463580

External references