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 A237748 #29 Apr 22 2025 02:43:01 %S A237748 4,6,23,496,2275974,800648638402240, %T A237748 1054942853799126580390222487977120, %U A237748 22436153203535039105819651040959324360753617244078062654624560815030272 %N A237748 Number of different ways to color the vertices of an n-dimensional hypercube using at most 2 colors. %C A237748 Two colorings are regarded as the same if they are conjugated by a permutation of the vertices caused by a rotation of the hypercube. %C A237748 Regarding mirrored coloring also as the same, the number of ways appears to be given by A000616. - _Seiichi Azuma_, Feb 14 2014 %H A237748 Seiichi Azuma, <a href="http://searial.web.fc2.com/hypercube/index.html">Number of different ways to color vertices of a n-dimensional hypercube using at most K colors</a> %e A237748 For n=2, there are 6 patterns to color the vertices of the square: %e A237748 ..1..1....1..1....1..1....1..0....1..0....0..0 %e A237748 ..1..1....1..0....0..0....0..1....0..0....0..0 %e A237748 For example, the next pattern is regarded as the same with the 3rd one above: %e A237748 ..1..0 %e A237748 ..1..0 %Y A237748 Cf. A000543. %Y A237748 Column 2 of A325012. %K A237748 nonn %O A237748 1,1 %A A237748 _Seiichi Azuma_, Feb 12 2014