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 A140261 #5 Jul 09 2025 04:29:10 %S A140261 3,5,7,10,14,21,32,47,71,106,158,237,356,533,800,1199,1799,2698,4046, %T A140261 6069,9104,13655,20483,30724,46085,69128,103691,155537,233305,349957, %U A140261 524935,787402,1181102,1771653,2657480,3986219,5979329,8968993 %N A140261 The length of Sapro's necklace at successive years in Werneck's Black Pearl Necklace problem. %H A140261 Nicolau Werneck, <a href="http://www.lti.pcs.usp.br/~nwerneck/adaptoide/">Adaptoide</a>, a library for adaptive finite automata. Source code in C++ available. %H A140261 Nicolau Werneck, <a href="http://network.nature.com/blogs/user/nwerneck/2008/01/18/the-black-pearl-necklace">The Black Pearl Necklace</a>, description of the problem. %H A140261 Nicolau Werneck, et al. <a href="http://forum.wolframscience.com/showthread.php?threadid=1506">Discussion on the NKS Forum</a> %Y A140261 a(n) = A140259(A140260(n)). Cf. A134342. %K A140261 nonn %O A140261 0,1 %A A140261 _Antti Karttunen_, May 16 2008, based on the 2008 postings by Nicolau Leal Werneck (nwerneck(AT)gmail.com)