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 A248571 #52 Feb 25 2015 15:27:30 %S A248571 1,0,0,0,1,1,3,28,547 %N A248571 Number of connected irreducible digital images of n points up to homotopy equivalence. %C A248571 "Irreducible" means not homotopy equivalent to any digital image of fewer points. The terms are nonzero for all n>4, and are believed to be strictly increasing for n>6. %H A248571 J. Haarmann, M. Murphy, C. Peters, and P. C. Staecker, <a href="http://arxiv.org/abs/1408.2584">Homotopy equivalence of finite digital images</a>, arXiv:1408.2584 [math.GN], 2014. %H A248571 P. C. Staecker, <a href="http://arxiv.org/abs/1502.06236">Some enumerations of binary digital images</a>, arXiv:1502.06236 [math.CO], 2015. %K A248571 nonn,more,hard %O A248571 1,7 %A A248571 _P. Christopher Staecker_, Oct 13 2014 %E A248571 a(8)-a(9) from _P. Christopher Staecker_, Feb 24 2015