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 A319156 #9 Dec 14 2019 21:23:40 %S A319156 1,3,11,44,186,814,3656,16731,77705,365095,1731797,8279363,39845689, %T A319156 192852359,937986507,4581678031,22464030959,110509938701,545269104263, %U A319156 2697646445713,13378627003520,66495716465315,331167284581601,1652340114446553,8258197397705302 %N A319156 Number of ways to build a contiguous building with n LEGO blocks of size 1 X 2 which is flat, i.e., with all blocks in parallel position. %H A319156 Rasmus Mølck Nilsson: <a href="https://www.math.ku.dk/english/research/tfa/ncg/paststudents/ms-theses/RMS_msthesis.pdf">On the number of flat LEGO structures</a>, Master's thesis in Mathematics, University of Copenhagen, 2016. %Y A319156 Cf. A123764, but here no identification up to rotation is performed. %K A319156 nonn %O A319156 1,2 %A A319156 _Søren Eilers_, Sep 12 2018