Number of reduced words of length n in Coxeter group on 4 generators S_i with relations (S_i)^2 = (S_i S_j)^3 = I.

A162740

Number of reduced words of length n in Coxeter group on 4 generators S_i with relations (S_i)^2 = (S_i S_j)^3 = I.

Terms

    a(0) =1a(1) =4a(2) =12a(3) =30a(4) =72a(5) =168a(6) =390a(7) =900a(8) =2076a(9) =4782a(10) =11016a(11) =25368a(12) =58422a(13) =134532a(14) =309804a(15) =713406a(16) =1642824a(17) =3783048a(18) =8711526a(19) =20060676a(20) =46195260a(21) =106377294a(22) =244963080a(23) =564094968a(24) =1298984214a(25) =2991269124a(26) =6888221772a(27) =15862029150a(28) =36526694472a(29) =84112781928

External references