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 A177986 #2 Mar 31 2012 10:22:16 %S A177986 1,3,4,8,9,15,16,19,20,24,25,28,33,35,36,40,48,49,51,63,64,65,68,73, %T A177986 80,81,84,99,100,104 %N A177986 Numbers n such that quartic curve y^2=x^4+n have integral points. %C A177986 To this sequence belonging as subset all perfect squares and squares-1. %C A177986 Complement to this sequence see A177987. %Y A177986 Cf. A054504, A081121. %K A177986 nonn %O A177986 1,2 %A A177986 _Artur Jasinski_, May 16 2010