52428800000domain: NAppears in sequencesLet d(1)=1 and d(n) = d(n-1)*n^(2n-2)*(2n-1)^(3-2n). Then a(n)=numerator(d(n)).at n=5A114876Numbers representable as x^x * y^y, with x > y > 1.at n=21A228174