1828503domain: NAppears in sequencesExpansion of g.f. x^3/(1 - 2*x + x^3 - x^4).at n=23A059633Number of reduced words of length n in Coxeter group on 19 generators S_i with relations (S_i)^2 = (S_i S_j)^3 = I.at n=5A162805a(0) = 1, a(n) = Sum_{k=1..n} a(n-k)*ceiling(sin(k)).at n=24A265826