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%I #9 Apr 14 2021 22:28:03
%S 1,6,336,2521476,705277897416,7107572010747738816,
%T 2578606199622659276537193216,33678386561031835867238388699701784576,
%U 15835071665743319426540573726368249140484891508736,268034865369025581797148715934176748584236925114472848300179456
%N Number of 6-colorings of an n X n grid, up to rotational symmetry.
%H Andrew Howroyd, <a href="/A047941/b047941.txt">Table of n, a(n) for n = 0..25</a>
%F a(n) = (m^(n^2) + 2 m^((n^2 + 3 (n mod 2))/4) + m^((n^2 + (n mod 2))/2))/4, with m = 6.
%Y Column k=6 of A343095.
%Y Cf. A047937.
%K nonn
%O 0,2
%A _Rob Pratt_
%E Terms a(9) and beyond from _Andrew Howroyd_, Apr 14 2021
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