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 A330846 #32 May 12 2020 05:45:04 %S A330846 19,301,1753,6913,17713,38497,80473,139927,225595,356329,549967, %T A330846 756901,1113283,1474867,1913365,2620789,3418081,4119175,5428993, %U A330846 6453235,7861957,9761335,11913115,13695055,16489633,19439797,22464883,25997329,30860593,33866305 %N A330846 The number of vertices 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 A330846 See the links in A331931 for images of the hexagons. %Y A330846 Cf. A331931 (regions), A331932 (n-gons), A330845 (edges), A092866, A332599, A007569. %K A330846 nonn %O A330846 1,1 %A A330846 _Scott R. Shannon_ and _N. J. A. Sloane_, Mar 07 2020 %E A330846 a(9)-a(30) from _Lars Blomberg_, May 12 2020