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 A176357 #5 Jun 18 2024 00:18:44
%S A176357 1,127,4054,37210,134325,776241,1313848,5536128,7280823,28243653,
%T A176357 32246894,74873810
%N A176357 Partial sums of A036403.
%C A176357 Partial sums of number of equilateral triangles whose vertices (whether connected by lines or not) lie at intersection points resulting from drawing lines connecting every pair of vertices of a regular 3n-gon (and extending beyond the polygon).
%F A176357 a(n) = Sum_{i=1..n} A036403(i).
%e A176357 a(4) = 1 + 126 + 3927 + 33156 = 37210 = 2 * 5 * 61^2.
%Y A176357 Cf. A006600, A036403.
%K A176357 nonn,more
%O A176357 1,2
%A A176357 _Jonathan Vos Post_, Apr 15 2010