9580032domain: NAppears in sequencesa(n) = Product_{1<=k<=n/2, gcd(k,n)=1} k.at n=24A124441[r]*[2r]*[3r]*...[nr], where r=(1+sqrt(5))/2 and []=floor.at n=8A147998The Gauss factorial n_5!.at n=12A232981a(n) is the product of the first n numbers not divisible by 5.at n=10A356858