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 A375996 #7 Jun 01 2025 18:01:33 %S A375996 0,1,2,5,8,13,18,24,31,38,47,56,67,78,90,103,116,131,146,163,180,199, %T A375996 217,238,257,280,301,326,349,375,400,427,454,483,512,543,574,606,639, %U A375996 672,707,742,779,816,854,893,932,973,1014,1057,1100,1145,1189,1236,1281 %N A375996 Number of integers y > 0 such that y < (n/2+x)*sqrt(3) and y < (n/2-x)*sqrt(3). %C A375996 Also number of integer coordinates of points inside an equilateral triangle with side length n, where one vertex is on the y-axis (Oy) and the other two vertices are on the x-axis (Ox). %Y A375996 Cf. A362873. %K A375996 nonn %O A375996 1,3 %A A375996 _Jean-Marc Rebert_, Sep 05 2024