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 A122030 #9 Jul 06 2018 08:08:01 %S A122030 16,38,200,2324,1189028,4996371438596,54444310605180563002616118404, %T A122030 1333929961635427338189657222796065386478968915403224556066936061387348857093217691444 %N A122030 See Comments lines for definition. %C A122030 Let "N_b" denote "N read in base b" and let "N" denote "N written in base 10" (as in normal life). The sequence is given by 16, 16_32, 16_(32_64), 16_(32_(64_128)), etc., or in other words %C A122030 ......16....16.....16.....16.......etc. %C A122030 ..............32.....32.....32......... %C A122030 .......................64.....64....... %C A122030 ................................128.... %C A122030 where the subscripts are evaluated from the bottom upwards %C A122030 More precisely, "N_b" means "Take decimal expansion of N and evaluate it as if it were a base-b expansion". %C A122030 The next term is too large to include. %C A122030 A "dungeon" of numbers. %D A122030 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 A122030 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 A122030 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. %Y A122030 Cf. A121863, A121263, A121266, A121264, A121265, A121295, A121296, A111050, A121866, A121864. %K A122030 nonn,base %O A122030 4,1 %A A122030 _N. J. A. Sloane_, Aug 31 2006