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 A376247 #4 Sep 16 2024 12:37:11
%S A376247 3,12,60,120,840,4760,7582680,3026164178520,277505140475561534945640,
%T A376247 260165888480949800316206335248860247693882960,
%U A376247 1735545885361077128120249087863835952607412447268583818069629193850545735375261166814160
%N A376247 a(n) is the denominator of Sum_{k = 1..n} 1 / (A376244(k) * A376245(k)).
%H A376247 Rémy Sigrist, <a href="/A376247/a376247.gp.txt">PARI program</a>
%o A376247 (PARI) \\ See Links section.
%Y A376247 Cf. A376244, A376245, A376246.
%K A376247 nonn,frac
%O A376247 1,1
%A A376247 _Rémy Sigrist_ and _N. J. A. Sloane_, Sep 16 2024