Number of reduced words of length n in Coxeter group on 4 generators S_i with relations (S_i)^2 = (S_i S_j)^7 = I.
A164353
Number of reduced words of length n in Coxeter group on 4 generators S_i with relations (S_i)^2 = (S_i S_j)^7 = I.
Terms
- a(0) =1a(1) =4a(2) =12a(3) =36a(4) =108a(5) =324a(6) =972a(7) =2910a(8) =8712a(9) =26088a(10) =78120a(11) =233928a(12) =700488a(13) =2097576a(14) =6281094a(15) =18808452a(16) =56321052a(17) =168650820a(18) =505017180a(19) =1512250884a(20) =4528366236a(21) =13559985966a(22) =40604758920a(23) =121589096856a(24) =364092999624
External references
- oeis: A164353