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 A128916 #10 Jul 06 2018 08:06:45 %S A128916 0,0,0,0,0,3,14,35,87,293,4833,22558,536782,11661394,46524255986, %T A128916 1092759075792482,159271598072111588499,3317896028408943302861440634, %U A128916 594387514787460257685718548861374047695,91930654519343922607883279072515432244874866615467943 %N A128916 a(n) = A121296(n) - A121295(n). %C A128916 All terms are >= 0. %D A128916 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 A128916 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 A128916 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 A128916 nonn %O A128916 10,6 %A A128916 _David Applegate_ and _N. J. A. Sloane_, Sep 21 2007