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 A228651 #15 Jul 29 2022 16:51:23 %S A228651 4,6,8,9,10,11,12,13,14,16,17,18,20,21,22,23,24,25,26,28,29,30,32,33, %T A228651 34,35,36,37,38,39,40,41,42,43,44,45,46,48,49,50,51,52,53,54,55,56,57, %U A228651 58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76 %N A228651 Numbers m such that if an urn contains m balls, with at least one 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 A228651 William Rex Marshall, <a href="/A228651/a228651.txt">Pascal program</a>. %o A228651 (Pascal) See the link section. %Y A228651 Cf. A228650, A228652, A228653. %K A228651 nonn %O A228651 1,1 %A A228651 _William Rex Marshall_, Aug 29 2013