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 A234942 #5 Jan 08 2014 22:12:30 %S A234942 17,34,49,65,83 %N A234942 Erroneous version of A013577. %C A234942 Included in accordance with OEIS policy of listing published but incorrect sequences, with pointers to the correct versions. %D A234942 CRC Handbook of Combinatorial Designs, 1996, p. 315. (But beware errors!) %K A234942 dead %O A234942 1,1