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 A255537 #7 Feb 25 2015 15:32:12 %S A255537 1,0,0,0,1,2,9,68,1110 %N A255537 Number of connected pointed-irreducible digital images of n points up to homotopy equivalence. %C A255537 "Pointed-irreducible" means that the identity map is not homotopic to any nonsurjective map having a fixed point. %H A255537 P. C. Staecker, <a href="http://arxiv.org/abs/1502.06236">Some enumerations of binary digital images</a>, arXiv 1502.06236 [math.CO], 2015. %Y A255537 Cf. A248571. %K A255537 nonn,more,hard %O A255537 1,6 %A A255537 _P. Christopher Staecker_, Feb 24 2015