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 A103472 #4 Sep 25 2022 10:40:15 %S A103472 12,35,118,82,118,269,585,985,1750,1438,1765,2718,4336,6040,8814,7678, %T A103472 8839,11876,16410,20970,27720,24998,27787,34763,44687,54133,67601, %U A103472 62252,67777,81066,99420,116465,140075,130711,140434,163027,193587,221521 %N A103472 Number of polyominoes consisting of 6 regular unit n-gons. %H A103472 S. Kurz, <a href="http://www.mathe2.uni-bayreuth.de/sascha/oeis/k-polyominoes.html">k-polyominoes</a>. %e A103472 a(3)=12 because there are 12 polyiamonds consisting of 6 triangles and a(4)=35 because there are 35 polyominoes consisting of 6 squares. %Y A103472 Cf. A103469, A103470, A103471, A103473. %K A103472 nonn %O A103472 3,1 %A A103472 _Sascha Kurz_, Feb 07 2005