Number of reduced words of length n in Coxeter group on 4 generators S_i with relations (S_i)^2 = (S_i S_j)^9 = I.
A165184
Number of reduced words of length n in Coxeter group on 4 generators S_i with relations (S_i)^2 = (S_i S_j)^9 = I.
Terms
- a(0) =1a(1) =4a(2) =12a(3) =36a(4) =108a(5) =324a(6) =972a(7) =2916a(8) =8748a(9) =26238a(10) =78696a(11) =236040a(12) =707976a(13) =2123496a(14) =6369192a(15) =19103688a(16) =57299400a(17) =171863208a(18) =515484678a(19) =1546139268a(20) =4637473692a(21) =13909589316a(22) =41720274396a(23) =125135347716a(24) =375329632284
External references
- oeis: A165184