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 A126937 #9 Feb 16 2025 08:33:04 %S A126937 0,1,8,7,22,21,6,19,20,41,40,19,18,39,38,67,68,105,104,67,66,37,38,17, %T A126937 16,37,36,35,62,63,98,99,64,101,100,99,142,141,98,97,140,139,96,97,62, %U A126937 61,34,33,60,61,96,95,138,137,94,93,136,137,188,187,246,247,314,315,248 %N A126937 A dragon curve is drawn on an Ulam spiral; a(n) is the integer written in the cell reached at step n. %C A126937 The spiral consists of the numbers 0, 1, 2, ... written in a spiral on squared paper. The dragon curve is a self-similar curve starting at the same point. See the illustration for more information. %H A126937 Philippe Lallouet, <a href="/A126937/a126937.pdf">Spreadsheet with illustration of initial terms</a> %H A126937 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/DragonCurve.html">Dragon Curve</a> [From _Klaus Brockhaus_, Aug 07 2008] %H A126937 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/PrimeSpiral.html">Prime Spiral</a> [From _Klaus Brockhaus_, Aug 07 2008] %Y A126937 Cf. A014577 (regular paper-folding [or dragon curve] sequence). [From _Klaus Brockhaus_, Aug 07 2008] %K A126937 nonn %O A126937 0,3 %A A126937 Philippe Lallouet (philip.lallouet(AT)wanadoo.fr), Mar 18 2007 %E A126937 Edited by _N. J. A. Sloane_, Mar 28 2007 %E A126937 a(9) - a(64) from _Klaus Brockhaus_, Aug 07 2008