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 A165658 #6 Jul 17 2015 10:58:56 %S A165658 1,1,1,4,6,48,64,96,576,1728,13824,165888,1036800,9953280,119439360, %T A165658 297271296,134369280000,222953472000,75246796800,32105299968000, %U A165658 229323571200,568865783808000000,125150472437760000,6129819058176000 %N A165658 Denominators of A002110 divided by A102647, starting from the second term of both. %o A165658 (PARI) a1(n)=prod(i=1, n, prime(i)); %o A165658 b1(n)=prod(i=1, n, prime(n+1)%prime(i)); %o A165658 a(n)=if(n<0, 0, denominator(a1(n)/b1(n))); %o A165658 for(n=1, 25, print1(a(n) ", ")) %Y A165658 Cf. A002110, A102647, A165657, A165659, A165660. %K A165658 easy,nonn %O A165658 1,4 %A A165658 _Creighton Dement_, Sep 24 2009