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 A089455 #4 Apr 07 2015 10:48:39
%S A089455 0,0,0,0,0,0,0,0,0,0,0,0,0,3,69,798,7021,51775,339958,2053872,
%T A089455 11665593,63192945,329798278,1670466031,8256762365,39992202198
%N A089455 Number of n-celled polyominoes with exactly 3 holes.
%H A089455 Tomás Oliveira e Silva, <a href="http://www.ieeta.pt/%7Etos/animals/a44.html">Animal enumerations on the {4,4} Euclidean tiling</a>
%Y A089455 Cf. A001419, A057418, A089454, A089456, A089457, A089458.
%K A089455 hard,nonn
%O A089455 1,14
%A A089455 _Joseph Myers_, Nov 04 2003