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 A123786 #7 Feb 15 2025 15:26:27 %S A123786 1,18,952,60878,4319328,325354277,25539764546,2066227060325 %N A123786 Number of ways, counted up to symmetry, to build a contiguous building with n LEGO blocks of size 1 X 5. %Y A123786 Cf. A112389, A123762 - A123827, A123829 - A123849. %K A123786 nonn,hard %O A123786 1,2 %A A123786 _Søren Eilers_, Oct 29 2006