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 A281529 #20 Jan 24 2017 20:43:25 %S A281529 2,3,7,23,163 %N A281529 a(n) = least denominator Y of any proper fraction X/Y which needs n or more terms to be written as a signed sum of distinct unit fractions. %D A281529 W. Sierpiński, O rozkładach liczb wymiernych na ułamki proste, PWN, Warsaw, Poland, 1957, pp. 96-100. %Y A281529 Cf. A281527. See A281532 for numerators. %K A281529 nonn,frac,hard,more %O A281529 1,1 %A A281529 _Arkadiusz Wesolowski_, Jan 23 2017