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 A123795 #7 Feb 15 2025 15:29:27 %S A123795 1,1,43,289,3796,30757,384465,3363194 %N A123795 Number of ways, counted up to symmetry, to build a contiguous building with n LEGO blocks of size 1 X 6 which is symmetric after a rotation by 180 degrees. %Y A123795 Cf. A112389, A123762 - A123827, A123829 - A123849. %K A123795 nonn %O A123795 1,3 %A A123795 _Søren Eilers_, Oct 29 2006