51972domain: NAppears in sequencesNumbers n such that (273*2^n-1)^2-2 is prime.at n=50A100913a(n) = 144*n^2 - 12.at n=18A158543Number of reduced words of length n in Coxeter group on 4 generators S_i with relations (S_i)^2 = (S_i S_j)^4 = I.at n=10A162921