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 A290726 #13 Jan 04 2024 15:11:55 %S A290726 1,1,1,2,2,2,2,2,3,3,3,3,4,4,4,4,4,4,5,5,5,5,5,5,6,6,6,6,6,6,6,6,6,6, %T A290726 6,7,7,7,7,7,8,8,8,8,8,8,8,8,8,8,9,9,9,9,9,9,9,9,9,9,10,10,10,10,10, %U A290726 10,10,10,10,10,11,11,11,11,11,11,11,11,11,11,12 %N A290726 a(n) = maximal number of semicircles that pass through an intersection point in the configuration A290447(n). %H A290726 Chai Wah Wu, <a href="/A290726/b290726.txt">Table of n, a(n) for n = 1..190</a> %H A290726 M. F. Hasler, <a href="/A290447/a290447_1.svg">Illustration for A290447(9) = 124</a>. (First instance where a triple intersection occurs, whence a(9) = 3.) %Y A290726 Cf. A290447. %K A290726 nonn %O A290726 1,4 %A A290726 _N. J. A. Sloane_, Aug 10 2017 %E A290726 More terms from _Chai Wah Wu_, Aug 10 2017