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 A359252 #22 Dec 24 2022 11:05:24 %S A359252 2,13,46,101,226,417,744,1169,1802,2599,3742,5139,7022,9261,12110, %T A359252 15367,19456,24117,29858,36323,43950,52595,62784,73931,86806,101059, %U A359252 117364,135155,155506 %N A359252 Number of vertices among all distinct circles that can be constructed from n equally spaced points along a line using only a compass. %C A359252 A circle is constructed for every pair of the n points, the first point defines the circle's center while the second the radius distance. The number of distinct circles constructed for n points is A001859(n-1). %C A359252 No formula for a(n) is currently known. %H A359252 Scott R. Shannon, <a href="/A359252/a359252.jpg">Image for n = 2</a>. %H A359252 Scott R. Shannon, <a href="/A359252/a359252_1.jpg">Image for n = 3</a>. %H A359252 Scott R. Shannon, <a href="/A359252/a359252_2.jpg">Image for n = 4</a>. %H A359252 Scott R. Shannon, <a href="/A359252/a359252_3.jpg">Image for n = 5</a>. %H A359252 Scott R. Shannon, <a href="/A359252/a359252_4.jpg">Image for n = 6</a>. %H A359252 Scott R. Shannon, <a href="/A359252/a359252_5.jpg">Image for n = 10</a>. %H A359252 Scott R. Shannon, <a href="/A359252/a359252_7.jpg">Image for n = 11</a>. %H A359252 Scott R. Shannon, <a href="/A359252/a359252_6.jpg">Image for n = 20</a>. %F A359252 a(n) = A359254(n) - A359253(n) + 1 by Euler's formula. %Y A359252 Cf. A359253 (regions), A359254 (edges), A359258 (k-gons), A001859, A290447, A331702, A358746. %K A359252 nonn,more %O A359252 2,1 %A A359252 _Scott R. Shannon_, Dec 22 2022