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 A094168 #7 Sep 21 2017 09:03:19 %S A094168 1,7,42,252,1505,8946,53165,315980,1878597,11171930,66456082, %T A094168 395399760,2352979538,14004512886 %N A094168 Number of rooted 2-dimensional polyominoes with n heptagonal cells, with no symmetries removed. %D A094168 Dan Hoey, Bill Gosper and Richard C. Schroeppel, Discussions in Math-Fun Mailing list, circa Jul 13 1999. %H A094168 R. C. Schroeppel, <a href="http://www.experimentalmath.info/workshop2004/schroeppel-talk.pdf">A few mathematical experiments</a> %Y A094168 A row of A094166. %K A094168 nonn %O A094168 1,2 %A A094168 _N. J. A. Sloane_, May 06 2004