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 A154471 #12 Jul 06 2025 14:58:15 %S A154471 31706,4517553,4875253,59657666,65204804,467824043836025, %T A154471 289931140991491544956,232993060651625904999520564, %U A154471 12090001045837621170309278896817,41831072194327417802054794318226030 %N A154471 Function A154470 iterated, starting from the initial value 31706. %C A154471 Note how A014486(31706) = 2988236 and (A014486->parenthesization 2988236) = (() (() (()) (())) (()) (())), from which, when after converting ()'s to e's we get: (e (e (e) (e)) (e) (e)), corresponding to the initial state e[e[e][e]][e][e] of Wolfram's system. A154472 gives the corresponding sequence with ()'s removed. %H A154471 Antti Karttunen, <a href="/A154471/b154471.txt">Table of n, a(n) for n = 0..100</a> %H A154471 Stephen Wolfram, <a href="http://www.wolframscience.com/nksonline/page-102">A New Kind of Science</a>, Wolfram Media Inc., (2002), pp. 102-104, 896-898. %F A154471 a(0) = 31706, a(n) = A154470(a(n-1)). %o A154471 (Scheme) (define (A154471 n) (if (= 0 n) 31706 (A154470 (A154471 (-1+ n))))) %Y A154471 Cf. A014486, A154470, A154472. %K A154471 nonn %O A154471 0,1 %A A154471 _Antti Karttunen_, Jan 11 2009