Number of reduced words of length n in Coxeter group on 3 generators S_i with relations (S_i)^2 = (S_i S_j)^21 = I.

A168872

Number of reduced words of length n in Coxeter group on 3 generators S_i with relations (S_i)^2 = (S_i S_j)^21 = I.

Terms

    a(0) =1a(1) =3a(2) =6a(3) =12a(4) =24a(5) =48a(6) =96a(7) =192a(8) =384a(9) =768a(10) =1536a(11) =3072a(12) =6144a(13) =12288a(14) =24576a(15) =49152a(16) =98304a(17) =196608a(18) =393216a(19) =786432a(20) =1572864a(21) =3145725a(22) =6291444a(23) =12582879a(24) =25165740a(25) =50331444a(26) =100662816a(27) =201325488a(28) =402650688a(29) =805300800

External references