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 A331245 #4 Jan 20 2020 13:05:20 %S A331245 1,2,2,2,3,3,3,3,3,4,4,4,4,4,3,4,5,5,4,5,5,5,5,4,5,4,6,5,6,6,5,6,6,6, %T A331245 6,5,6,4,5,5,6,7,7,6,7,7,6,7,7,7,6,7,5,6,5,6,7,8,6,8,7,7,8,8,7,8,7,8, %U A331245 8,8,7,8,6,7,8,5,6,7,6,7,9,8,9,9,7,8,9 %N A331245 Triangles with integer sides i <= j <= k sorted by radius of enclosing circle, and, in case of ties, lexicographically by side lengths (smallest first). The sequence gives the middle side j. The other sides are in A331244 and A331246. %C A331245 The enclosing circle differs from the circumcircle by limiting the radius to (longest side)/2 for obtuse triangles, i.e., those with i^2 + j^2 < k^2. %e A331245 See A331244. %Y A331245 Cf. A331244 (shortest side), A331246 (longest side). %K A331245 nonn %O A331245 1,2 %A A331245 _Hugo Pfoertner_, Jan 20 2020