This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A120066 #2 Apr 03 2014 11:35:06 %S A120066 1,1,1,3,1,30,1,105,28,630,1,207900,1,12012,45045,675675,1,171531360, %T A120066 1,2618916300,3527160,3879876,1,139143023019000,10626,67603900, %U A120066 43743700,21925567263600,1,2360561385517335000,1,203067496256625,14902327440 %N A120066 (n-1)! divided by (product phi(d)! ; d divides n). %o A120066 (PARI) a(n) = (n-1)! / prod(i=1, n, if(n%i==0, eulerphi(i)!, 1)) %Y A120066 Cf. A120065. %K A120066 nonn %O A120066 1,4 %A A120066 _Martin Fuller_, Jun 06 2006