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 A259711 #89 Feb 16 2025 08:33:26 %S A259711 1,2,4,5,8,10,14,16,20,25,28,32,40,42,50,56,64,70,80,84,100,112,125, %T A259711 128,132,140,160,168,196,200,210,224,250,256,264,280,320,336,350,392, %U A259711 400,420,429,448,500,512,528,560,588,625,640,660,672,700,784,800,840 %N A259711 Numbers that can be written as a product of Catalan numbers. %H A259711 David A. Corneth, <a href="/A259711/b259711.txt">Table of n, a(n) for n = 1..10000</a> %H A259711 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/CatalanNumber.html">Catalan Number</a> %e A259711 70 = 5*14 = C(3)*C(4). - _David A. Corneth_, Mar 26 2021 %Y A259711 Cf. A000108, A001013, A003046, A005568, A014228, A259711, A342288. %K A259711 nonn %O A259711 1,2 %A A259711 _Ilya Gutkovskiy_, Apr 14 2020