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 A130412 #7 Jul 01 2023 12:10:56 %S A130412 2,5,140,105,2310,15015,120120,85085,9699690,4849845,446185740, %T A130412 557732175,3346393050,48522699225,24067258815600,1504203675975, %U A130412 3008407351950,55655536011075,222622144044300,2281876976454075 %N A130412 Denominator of partial sums of a series for 3*(Pi-3). %C A130412 Numerators are given in A130411. %F A130412 a(n) = denominator(r(n)) with the rationals r(n) defined in A130411. %Y A130412 Cf. A130411. %K A130412 nonn,frac,easy %O A130412 1,1 %A A130412 _Wolfdieter Lang_, Jun 01 2007, Sep 09 2008