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 A296097 #9 Dec 26 2017 18:28:54 %S A296097 25200,61425,145530,500500,749700,828828,1185030,2031120,2162160, %T A296097 2821500,4573800,5364450,13857480,17907120,20991960,21783300,24643710, %U A296097 27162135,29610360,30933045,34283340,37191000,40901490,60769800,64292130,71216145,76576500,90041490 %N A296097 Triangular numbers that can be represented as a product of two triangular numbers greater than 1, as a product of three triangular numbers greater than 1, and as a product of four triangular numbers greater than 1. %C A296097 Triangular numbers in the products need not be distinct, that is, duplicates in the products are allowed. %C A296097 A subsequence of A188630 and of A295769. %e A296097 25200 = 210 * 120 = 120 * 21 * 10 = 28 * 15 * 10 * 6. %Y A296097 Cf. A000217, A188630, A295769. %K A296097 nonn %O A296097 1,1 %A A296097 _Alex Ratushnyak_, Dec 04 2017