531924domain: NAppears in sequencesFor 1 < x, each c(i) is "multiply" (*) or "divide" (/); a(n) is number of choices for c(0),...,c(n-1) so that 1 c(0) x^1 c(1) x^2,.., c(n-1) x^n is an integer.at n=20A059529A060448 sorted and duplicates removed.at n=40A060636