Number of reduced words of length n in Coxeter group on 5 generators S_i with relations (S_i)^2 = (S_i S_j)^5 = I.

A163316

Number of reduced words of length n in Coxeter group on 5 generators S_i with relations (S_i)^2 = (S_i S_j)^5 = I.

Terms

    a(0) =1a(1) =5a(2) =20a(3) =80a(4) =320a(5) =1270a(6) =5040a(7) =20010a(8) =79440a(9) =315360a(10) =1251930a(11) =4969980a(12) =19730070a(13) =78325380a(14) =310939920a(15) =1234384470a(16) =4900319640a(17) =19453527810a(18) =77227563240a(19) =306581745960

External references