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 A089516 #10 Mar 15 2018 04:20:36 %S A089516 1,4,56,5712,18786768,955776822000,744550144338000, %T A089516 187882017072683934000,114232266380191831872000, %U A089516 1559289924571192031300084690688000 %N A089516 Denominators used in A089515 to compute the column sequences of triangle A090215. %F A089516 a(n) = lcm(seq(denominator(a(n, m)), m=1..n)) with the a(n, m) formula given in A089515(n, m) but without the D(n) factor in front and lcm denotes the least common multiple of a set of numbers. %K A089516 nonn,easy %O A089516 1,2 %A A089516 _Wolfdieter Lang_, Dec 01 2003