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 A103471 #4 Sep 25 2022 10:39:53 %S A103471 4,12,25,22,25,50,82,127,186,168,187,263,362,472,614,566,615,776,972, %T A103471 1179,1437,1347,1439,1711,2045,2376,2786,2641,2790,3204,3707,4193, %U A103471 4790,4575,4796,5380,6089,6760,7578,7282,7584,8373,9321,10207,11282,10890 %N A103471 Number of polyominoes consisting of 5 regular unit n-gons. %H A103471 S. Kurz, <a href="http://www.mathe2.uni-bayreuth.de/sascha/oeis/k-polyominoes.html">k-polyominoes</a>. %e A103471 a(3)=4 because there are 4 polyiamonds consisting of 5 triangles and a(4)=12 because there are 12 polyominoes consisting of 5 squares. %Y A103471 Cf. A103469, A103470, A103472, A103473. %K A103471 nonn %O A103471 3,1 %A A103471 _Sascha Kurz_, Feb 07 2005