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 A120103 #6 Apr 04 2014 18:35:09 %S A120103 160,1285,14445,6572,14982,65323,280014,664411,1908239,1314914, %T A120103 1968684,4158216,9707046,17054708,33522023,26019735,33942901,56537856, %U A120103 100952307,153177526,251530341,208524646,254079408,374310135,586169115,812395658 %N A120103 Number of polyominoes consisting of 9 regular unit n-gons. %H A120103 Matthias Koch and Sascha Kurz, <a href="http://arxiv.org/abs/math/0605144">Enumeration of generalized polyominoes</a>, preprint, arXiv:math.CO/0605144 %e A120103 a(3)=160 because there are 160 polyiamonds consisting of 9 triangles and a(4)=1285 because there are 1285 polyominoes consisting of 9 squares. %Y A120103 Cf. A000577, A000104, A000105, A000228, A103465, A103466, A103467, A103468, A103469, A103470, A103471, A103472, A103473, A103465, A120102, A120104. %K A120103 nonn %O A120103 3,1 %A A120103 _Sascha Kurz_, Jun 09 2006