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 A228653 #15 Jul 29 2022 16:51:31 %S A228653 4,8,9,11,12,16,25,29,36,46,48,49,55,57,64,66,81,88,89,97,99,100,120, %T A228653 121,144,145,147,156,162,164,165,166,169,176,196,217,225 %N A228653 Numbers m such that if an urn contains m balls, with distinct positive numbers for each of c colors, for some c > 1 there exists a combination of c colors such that it is equally probable for c balls randomly selected from the urn to all be either the same color or distinct colors. %H A228653 William Rex Marshall, <a href="/A228653/a228653.txt">Pascal program</a>. %o A228653 (Pascal) See the link section. %Y A228653 Cf. A228650, A228651, A228652. %K A228653 nonn,more %O A228653 1,1 %A A228653 _William Rex Marshall_, Aug 29 2013