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 A195561 #9 Jun 04 2015 14:32:46 %S A195561 1,5,109,289,1009,1189,6485,141481,375121,1309681,1543321,8417525, %T A195561 183642229,486906769,1699964929,2003229469,10925940965,238367471761, %U A195561 632004611041,2206553168161,2600190307441,14181862955045,309400794703549 %N A195561 Hypotenuses of primitive Pythagorean triples in A195559 and A195560. %C A195561 See A195500 for discussion and list of related sequences; see A195559 for Mathematica program. %F A195561 Empirical g.f.: -x*(x^9+x^8+x^7+5*x^6+109*x^5-1009*x^4-289*x^3-109*x^2-5*x-1) / (x^10-1298*x^5+1). - _Colin Barker_, Jun 04 2015 %Y A195561 Cf. A195500, A195559, A195560. %K A195561 nonn %O A195561 1,2 %A A195561 _Clark Kimberling_, Sep 21 2011