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 A127744 #10 Jul 06 2018 08:07:10 %S A127744 0,0,0,0,0,5,17,38,86,365,1530,11770,249015,14102902,5358889889, %T A127744 19563802359728,3359230167951553969,181335944930584275675827047, %U A127744 54416647690014492928933662292768842690,6605721238793689879501639879905020611382966457124063495,360539645288616164606228883801608423987740093330992456820074646988075733781755269 %N A127744 a(n) = A121265(n) - A121295(n). %C A127744 All terms are >= 0. %D A127744 David Applegate, Marc LeBrun and N. J. A. Sloane, Descending Dungeons and Iterated Base-Changing, in "The Mathematics of Preference, Choice and Order: Essays in Honor of Peter Fishburn", edited by Steven Brams, William V. Gehrlein and Fred S. Roberts, Springer, 2009, pp. 393-402. %H A127744 David Applegate, Marc LeBrun and N. J. A. Sloane, <a href="https://arxiv.org/abs/math/0611293">Descending Dungeons and Iterated Base-Changing</a>, arXiv:math/0611293 [math.NT], 2006-2007. %H A127744 David Applegate, Marc LeBrun, N. J. A. Sloane, <a href="https://www.jstor.org/stable/40391135">Descending Dungeons, Problem 11286</a>, Amer. Math. Monthly, 116 (2009) 466-467. %K A127744 nonn %O A127744 10,6 %A A127744 _David Applegate_ and _N. J. A. Sloane_, Sep 21 2007