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 A260782 #4 Jun 16 2016 23:27:56 %S A260782 0,0,1,5,31,197,1435,11765,107755 %N A260782 Erroneous version of A002469. %H A260782 A. Steen, <a href="http://resolver.sub.uni-goettingen.de/purl?PPN600494829_0015/DMDLOG_0031">Some formulas respecting the game of mousetrap</a>, Quart. J. Pure Applied Math., 15 (1878), 230-241. %K A260782 dead %O A260782 2,4