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 A195558 #9 Jun 04 2015 14:27:20 %S A195558 1,13,25,37,493,949,1405,18721,36037,53353,710905,1368457,2026009, %T A195558 26995669,51965329,76934989,1025124517,1973314045,2921503573, %U A195558 38927735977,74933968381,110940200785,1478228842609,2845517484433,4212806126257 %N A195558 Hypotenuses of primitive Pythagorean triples in A195556 and A195557. %C A195558 See A195500 for discussion and list of related sequences; see A195556 for Mathematica program. %F A195558 Empirical g.f.: -x*(x^5+x^4+x^3-25*x^2-13*x-1)/(x^6-38*x^3+1). - _Colin Barker_, Jun 04 2015 %Y A195558 Cf. A195500, A195556, A195557. %K A195558 nonn %O A195558 1,2 %A A195558 _Clark Kimberling_, Sep 21 2011