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 A090436 #10 Mar 15 2018 04:19:14 %S A090436 1,5,100,27500,687500,7075062500,3594287401375000, %T A090436 81456034414253835114625000,35683959264371194185124824344091625000, %U A090436 140789696830026154896057937831705061406034875000 %N A090436 Denominators used to compute the column sequences of triangle A090217. %C A090436 a(n) = lcm(seq(denominator(a(n,m)),m=1..n)) with the a(n,m) formula given in A090435(n,m) but without the D(n) factor in front and lcm denotes the least common multiple of a set of numbers. %K A090436 nonn,easy %O A090436 1,2 %A A090436 _Wolfdieter Lang_, Dec 01 2003