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 A289136 #12 Feb 16 2025 08:33:48
%S A289136 1,1,270,30066912,3662498214110836,978788002444637886853083440,
%T A289136 1017523795194980592656592864724960780556190,
%U A289136 6723457445689415320074916040888682277646129463792942126176174
%N A289136 Number of colorings of the n X n king graph up to permutation of the colors.
%H A289136 Jean-François Alcover, <a href="/A289136/b289136.txt">Table of n, a(n) for n = 1..11</a>
%H A289136 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/KingGraph.html">King Graph</a>
%t A289136 A208021 = Import["https://oeis.org/A208021/b208021.txt", "Table"][[All, 2]];
%t A289136 a[n_] := A208021[[2 n^2 - 2 n + 1]];
%t A289136 Table[a[n], {n, 1, 11}] (* _Jean-François Alcover_, Sep 23 2019 *)
%Y A289136 Main diagonal of A208021.
%Y A289136 Cf. A212208, A212209.
%K A289136 nonn
%O A289136 1,3
%A A289136 _Andrew Howroyd_, Jun 25 2017