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 A080990 #2 Mar 31 2012 10:29:02 %S A080990 5,23,497,235457,53392510817,2766001621753572646817, %T A080990 7464467658097380439898886826586276934412577, %U A080990 54590148152787377961058637956673631049748025019190698768473358337478050935712219773217 %N A080990 Ratios of successive terms of A080988. %Y A080990 Cf. A080988, A080581, A080986. %K A080990 nonn %O A080990 1,1 %A A080990 _Hugo Pfoertner_, Feb 26 2003