79440domain: NAppears in sequencesPentanacci numbers: a(n) = a(n-1) + a(n-2) + a(n-3) + a(n-4) + a(n-5), starting 1,0,0,0,1.at n=21A124313Number 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.at n=8A163316a(n) = n*Fibonacci(n) * Sum_{d|n} 1/(d*Fibonacci(d)).at n=18A203319