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 A331249 #6 Jan 26 2020 07:35:52 %S A331249 3,15,35,3,63,63,99,8,135,143,195,231,15,27,255,275,80,323,351,24,399, %T A331249 455,483,495,55,35,575,16,663,675,75,735,48,12,783,91,855,224,899,935, %U A331249 975,63,63,1023,1071,1071,1155,135,1235,80,320,1295,1311,21,1443,1463 %N A331249 Squared numerator of y-coordinate of 3rd point of n-th triangle with integer sides in a sorted list corresponding to A331247. The y-coordinate is given by sqrt(a(n))/A331248(n). %e A331249 a(1) = 3 because the 3rd point of the smallest triangle with integer sides (1,1,1) is at (x,y)=(1/2,sqrt(3)/2), A331247(1)=1, A331248(1)=2. %e A331249 See A331247 for an extended list. %Y A331249 Cf. A331247, A331248, A331251, A331252, A331253, A331695, A331696, A331697. %K A331249 nonn %O A331249 1,1 %A A331249 _Hugo Pfoertner_, Jan 23 2020