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 A338152 #13 Oct 13 2020 14:30:38
%S A338152 1,2,24,24024,193270310,767795414400
%N A338152 a(n) is the number of acyclic orientations of the edges of an n-dimensional demihypercube.
%H A338152 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/HalvedCubeGraph.html">Halved Cube Graph</a>
%F A338152 a(n) = |Sum_{k=0..2^(n-1)} (-1)^k * A334280(n, k)|.
%t A338152 Table[Abs[ChromaticPolynomial[GraphData[{"HalvedCube",n}]][-1]],{n,1,6}]
%Y A338152 Cf. A137888, A290060, A295174, A334280.
%Y A338152 Cf. A033815 (cross-polytope), A058809 (wheel), A334247 (hypercube), A338153 (prism), A338154 (antiprism).
%K A338152 nonn,more
%O A338152 1,2
%A A338152 _Peter Kagey_, Oct 13 2020