A047941 Number of 6-colorings of an n X n grid, up to rotational symmetry.
1, 6, 336, 2521476, 705277897416, 7107572010747738816, 2578606199622659276537193216, 33678386561031835867238388699701784576, 15835071665743319426540573726368249140484891508736, 268034865369025581797148715934176748584236925114472848300179456
Offset: 0
Keywords
Links
- Andrew Howroyd, Table of n, a(n) for n = 0..25
Formula
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.
Extensions
Terms a(9) and beyond from Andrew Howroyd, Apr 14 2021