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 A070204 #18 Feb 16 2025 08:32:46 %S A070204 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0, %T A070204 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,1,0,0,0,0, %U A070204 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 %N A070204 Number of isosceles integer triangles with perimeter n having integral inradius. %C A070204 a(n) = A070201(n) - A070203(n). %H A070204 Seiichi Manyama, <a href="/A070204/b070204.txt">Table of n, a(n) for n = 1..5000</a> %H A070204 Mohammad K. Azarian, <a href="http://www.jstor.org/stable/25678790">Solution to Problem S125: Circumradius and Inradius</a>, Math Horizons, Vol. 16, Issue 2, November 2008, p. 32. %H A070204 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/Incircle.html">Incircle</a>. %H A070204 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/IsoscelesTriangle.html">Isosceles Triangle</a>. %H A070204 R. Zumkeller, <a href="/A070080/a070080.txt">Integer-sided triangles</a> %Y A070204 Cf. A070139, A059169. %K A070204 nonn %O A070204 1,108 %A A070204 _Reinhard Zumkeller_, May 05 2002