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 A101630 #4 Oct 12 2012 14:40:23 %S A101630 1,42,6006,204204,3879876,446185740,38818159380,2406725881560, %T A101630 89048857617720,3651003162326520,156993135980040360, %U A101630 51650741737433278440,2737489312083963757320,2737489312083963757320 %N A101630 Denominator of partial sums of a certain series. %C A101630 The numerators are given in A101629. %C A101630 a(13) and a(14) are indeed identical, namely 2737489312083963757320. %F A101630 a(n)=denominator(s(n)) with s(n)=15*sum(1/((4*k-1)*k*(4*k+1)), k=1..n). %K A101630 nonn,frac,easy %O A101630 1,2 %A A101630 _Wolfdieter Lang_, Dec 23 2004