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 A343096 #17 Jul 06 2024 09:57:53
%S A343096 1,1,6,4995,1073758336,74505806274453125,2578606199622659276537193216,
%T A343096 64230894380264719522488136461023341060807,
%U A343096 1569275433846670190958947355821723644654155086251882971136,49156762618888228404518977131728029071108432602235970059344750602021716398409
%N A343096 Number of n-colorings of an n X n grid, up to rotational symmetry.
%H A343096 Andrew Howroyd, <a href="/A343096/b343096.txt">Table of n, a(n) for n = 0..25</a>
%H A343096 Peter Kagey and William Keehn, <a href="https://cs.uwaterloo.ca/journals/JIS/VOL27/Kagey/kagey6.html">Counting Tilings of the n X m Grid, Cylinder, and Torus</a>, J. Int. Seq. (2024) Vol. 27, Art. No. 24.6.1. See p. 2.
%F A343096 a(n) = (n^(n^2) + 2*n^((n^2 + 3*(n mod 2))/4) + n^((n^2 + (n mod 2))/2))/4.
%p A343096 a:= n-> (n^(n^2)+2*n^((n^2+3*(n mod 2))/4)+n^((n^2+(n mod 2))/2))/4:
%p A343096 seq(a(n), n=0..10); # _Alois P. Heinz_, May 12 2021
%o A343096 (PARI) a(n) = {(n^(n^2) + 2*n^((n^2 + 3*(n%2))/4) + n^((n^2 + (n%2))/2))/4}
%Y A343096 Main diagonal of A343095.
%Y A343096 Cf. A002489.
%K A343096 nonn
%O A343096 0,3
%A A343096 _Andrew Howroyd_, Apr 14 2021