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 A123835 #8 Oct 09 2013 14:20:53 %S A123835 25,757,29925,1281402,59340183,2862828262,142920335981,7311973715989 %N A123835 Number of ways to build a contiguous building with n LEGO blocks of size 3 X 3 on top of a fixed block of the same size. %C A123835 The base block is not counted among the n and must be the only block in the bottom layer of the building %H A123835 M. Abrahamsen and S. Eilers, <a href="http://dx.doi.org/10.1080/10586458.2011.564539">On the asymptotic enumeration of LEGO structures</a>, Exper Math. 20 (2) (2011) 145-152. %H A123835 B. Durhuus and S. Eilers, <a href="http://arxiv.org/abs/math/0504039">On the entropy of LEGO</a>, arXiv:math.CO/0504039 %K A123835 nonn,hard %O A123835 1,1 %A A123835 _Søren Eilers_, Oct 29 2006