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 A381320 #17 Feb 21 2025 11:48:58 %S A381320 6,66,85200,183250434809856, %T A381320 1823313150135576711941779566275453880631296, %U A381320 1796015231442383417566549899388909415521140128662444489798112174969514654167314109511319978572879992886003172220405085684891648 %N A381320 Number of minimum vertex colorings in the n-Hanoi graph. %H A381320 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/MinimumVertexColoring.html">Minimum Vertex Coloring</a>. %H A381320 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/HanoiGraph.html">Hanoi Graph</a>. %F A381320 a(n) = P_n(3), where P_n is the chromatic polynomial given by A193233 or A288839. %Y A381320 Cf. A193233 (coefficients of chromatic polynomial). %Y A381320 Cf. A288839 (coefficients of chromatic polynomial, highest powers first). %K A381320 nonn %O A381320 1,1 %A A381320 _Eric W. Weisstein_, Feb 21 2025