a(n) = lcm(n!,n!')/gcd(n!,n!'), where n!' is the arithmetic derivative of n! (A068311).

A189100

a(n) = lcm(n!,n!')/gcd(n!,n!'), where n!' is the arithmetic derivative of n! (A068311).

Terms

    a(0) =0a(1) =2a(2) =30a(3) =66a(4) =1830a(5) =645a(6) =33180a(7) =198870a(8) =228270a(9) =64785a(10) =7960260a(11) =9738960a(12) =1663226565a(13) =7232635410a(14) =857066210a(15) =1057466410a(16) =307311194190a(17) =767464487790

External references