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 A179121 #9 Jun 02 2025 02:59:13 %S A179121 18,307,93943,8825193307,77884036897092402943, %T A179121 6065923203387650816975131277148782658307, %U A179121 36795424309396699379852983331957135547989414580911143782409880284213748733447943 %N A179121 Variant of Sylvester's sequence: a(n + 1) = a(n)^2 - a(n) + 1, with a(1) = 18. %D A179121 Mohammad K. Azarian, Sylvester's Sequence and the Infinite Egyptian Fraction Decomposition of 1, Problem 958, College Mathematics Journal, Vol. 42, No. 4, September 2011, p. 330. Solution published in Vol. 43, No. 4, September 2012, pp. 340-342 %H A179121 Markus Tervooren, <a href="http://factordb.com/search.php?se=28&aq=18&action=all">Factorizations of Silvester/Euclid sequence 18</a> %Y A179121 Cf. A144779, A144780, A144781, A144782, A144783, A144784, A144785, A179090, A179091, A179092, A179093 %K A179121 nonn %O A179121 1,1 %A A179121 _Ivan Panchenko_, Jun 30 2010