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A047943
Number of 8-colorings of an n X n grid, up to rotational symmetry.
3
1, 8, 1044, 33562880, 70368748374016, 9444732965876730429440, 81129638414606686199388699623424, 44601490397061246283080881278262737180295168, 1569275433846670190958947355821723644654155086251882971136
OFFSET
0,2
LINKS
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 = 8.
CROSSREFS
Column k=8 of A343095.
Cf. A047937.
Sequence in context: A320981 A316395 A176372 * A089672 A279881 A246114
KEYWORD
nonn
AUTHOR
EXTENSIONS
Terms a(8) and beyond from Andrew Howroyd, Apr 14 2021
STATUS
approved