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 A001984 #9 Jul 25 2015 20:00:57 %S A001984 7,23,71,311,479,1559,5711,10559,18191,31391,307271,366791,366791, %T A001984 2155919 %N A001984 Erroneous version of A045535. %H A001984 D. H. Lehmer, E. Lehmer and D. Shanks, <a href="/A002189/a002189.pdf">Integer sequences having prescribed quadratic character</a>, Math. Comp., 24 (1970), 433-451 [Annotated scanned copy] %K A001984 dead %O A001984 1,1