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 A330845 #39 May 12 2020 05:45:02 %S A330845 42,708,4020,15120,38544,83136,169686,294678,475500,746340,1140624, %T A330845 1581612,2296986,3055734,3980526,5391264,7003662,8516346,11094810, %U A330845 13280970,16180932,19971282,24277212,28090218,33683862,39656604,45901494,53121744,62678268,69382632 %N A330845 The number of edges inside a hexagon formed by the straight line segments mutually connecting all vertices and all points that divide the sides into n equal parts. %C A330845 See the links in A331931 for images of the hexagons. %Y A330845 Cf. A331931 (regions), A331932 (n-gons), A330846 (vertices), A274586 , A332600, A331765. %K A330845 nonn %O A330845 1,1 %A A330845 _Scott R. Shannon_ and _N. J. A. Sloane_, Mar 07 2020 %E A330845 a(9)-a(30) from _Lars Blomberg_, May 12 2020