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 A030233 #11 Feb 16 2025 08:32:35 %S A030233 1,2,6,34,166,991,5931,37196,235456,1514618,9826177,64284947, %T A030233 423241426,2802300793,18642694440,124544085550,835091956750 %N A030233 Number of n-celled one-sided polyplets. %H A030233 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/Polyplet.html">Polyplet.</a> %Y A030233 Cf. A030222. %K A030233 nonn,hard %O A030233 1,2 %A A030233 _David W. Wilson_ %E A030233 More terms from _Joseph Myers_, Sep 26 2002