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 A094177 #8 Nov 01 2014 10:22:42 %S A094177 4,3,4,9,21,51 %N A094177 Sequence from an aptitude test that I cannot work out! %C A094177 Is this an erroneous version of A249453? - _Arkadiusz Wesolowski_, Oct 29 2014 %F A094177 For n>0, a(n) = 2^(n+1)-A091855(n) = 3+A128543(n). - _M. F. Hasler_, Nov 01 2014 %K A094177 nonn,unkn,bref %O A094177 1,1 %A A094177 Dominique Butterworth (dominique_butterworth(AT)hotmail.com), May 06 2004