Number of reduced words of length n in Coxeter group on 3 generators S_i with relations (S_i)^2 = (S_i S_j)^9 = I.

A165183

Number of reduced words of length n in Coxeter group on 3 generators S_i with relations (S_i)^2 = (S_i S_j)^9 = I.

Terms

    a(0) =1a(1) =3a(2) =6a(3) =12a(4) =24a(5) =48a(6) =96a(7) =192a(8) =384a(9) =765a(10) =1524a(11) =3039a(12) =6060a(13) =12084a(14) =24096a(15) =48048a(16) =95808a(17) =191040a(18) =380934a(19) =759585a(20) =1514616a(21) =3020151a(22) =6022194a(23) =12008280a(24) =23944560a(25) =47745552a(26) =95204832a(27) =189838836a(28) =378539436a(29) =754809225

External references