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 A099458 #12 Sep 09 2015 01:26:48 %S A099458 1,4,9,12,-1,-56,-178,-336,-321,412,2729,7084,11202,5724,-29911, %T A099458 -121988,-266881,-338976,54222,1644184,5108159,9479212,8682249, %U A099458 -12837036,-79315198,-202151756,-313431031,-143085588,892383039 %N A099458 An Alexander sequence for the knot 9_44. %C A099458 The denominator 1-4x+7x^2-4x^3+x^4 is a parameterization of the Alexander polynomial for the knot 9_44. 1/(1-4x+7x^2-4x^3+x^4) is the image of the g.f. of A099456 under the modified Chebyshev transform A(x)->(1/(1+x^2)^2)A(x/(1+x^2)). %H A099458 Dror Bar-Natan, <a href="http://katlas.org/wiki/9_44">The knot 9_44 in the Rolfsen Knot Table at the Knot Atlas</a> %F A099458 G.f.: (1-x)*(1+x)*(1+x^2)/(1-4*x+7*x^2-4*x^3+x^4); a(n)=A099457(n)-A099457(n-2). %K A099458 easy,sign %O A099458 0,2 %A A099458 _Paul Barry_, Oct 16 2004