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 A123824 #33 Nov 17 2020 14:09:20 %S A123824 1,16,697,34958,1947321,114675898,7026150623,443114008903, %T A123824 28575438072945,1875587744568411 %N A123824 Number of ways, counted up to symmetry, to build a contiguous building with n LEGO blocks of size 2 X 3. %H A123824 Matthias Simon, <a href="/A123824/a123824_2.cpp.txt">Program to compute a(1)...a(10)</a> %Y A123824 Cf. A112389, A123762 - A123827, A123829 - A123849. %K A123824 nonn,hard,more %O A123824 1,2 %A A123824 _Søren Eilers_, Oct 29 2006 %E A123824 a(9) from _Matthias Simon_, Aug 29 2020 %E A123824 a(10) from _Matthias Simon_, Nov 15 2020