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 A123790 #7 Feb 15 2025 15:28:17 %S A123790 34,1516,93664,6366476,468438942,36108392112,2882260782674 %N A123790 Number of ways to build a contiguous building with n LEGO blocks of size 1 X 5 on top of a fixed block of the same size. %C A123790 The base block is not counted among the n and must be the only block in the bottom layer of the building. %Y A123790 Cf. A112389, A123762 - A123827, A123829 - A123849. %K A123790 nonn,hard %O A123790 1,1 %A A123790 _Søren Eilers_, Oct 29 2006